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1. Mr. Minh is elected the Head of the ______ Union.
A. s' Farmers B. Farmers C. Farmers' D. Farmer's
2. Mai and Minh decided to go ______ a walk.
A. by B. for C. on D. in
3. My parents ____ bought me a new motorbike if I had not failed the exam.
A. will B. will have C. would D. would have
4. The farm could _____ imported more machines.
A. have B. had C. has D. having
5. The village would have ______ a new school if they had had enough money.
A. builded B. built C. build D. building
6. My grandfather ______ teach literature at a high school, but he is now retired.
A. used to B. is used to C. use to D. was used to
7. This is a wheat crop _______ in the farm.
A. grow B. growing C. grown D. grows
8. It rained ______ heavily ______ after only half an hour, everywhere was covered with water.
A. so/ that B. such/ that C. very/ that D. so/ then
9. We decided to drive back through a new road ______ was much longer but safer.
A. what B. where C. which D. how
10. It's the first time I ______ a bird of this colour.
A. see B. am seeing C. can see D. have seen
11. The ground is hard and dry. It hasn't rained _____ ages.
A. from B. for C. since D. by
12. If I _____ the leader of the team, I ______ do a lot of things.
A. was/ will B. was/would C. were/would D. had been/ would
13. I ______ to the author if I thought he would publish the article.
A. write B. had writen C. would write D. had written
14. The black bear suddenly appeared from ______ the tent.
A. behind B. out C. with D. after
15. He ____ on a trip to America if he had time and money.
A. will go B. would have gone C. goes D. would go
16. Most snakes eat animals _____ than their own size.
A. large B. that are large
C. which are larger D. are large
17. If we went that way, I am sure we ______ get there quicker.
A. can B. must C. need D. would
18. Even if the rain ______ now, there won't be a harvest this year.
A. came B. comes C. didn't come D. will come
19. I'd rather ______ to a concert than a film, if you don't mind.
A. go B. going C. gone D. to go
20. _______ is one of the few substances that can be frozen.
A. It is water B. water C. that water D. though water
21. The Pharaohs _______ the rulers of ancient Egypt.
A. were used B, used to be C. were used to D. were used to being
22. The bell rang, but I didn't hear it. I ______ asleep.
A. were B. must be C. must have been D. was
23. If I had known Chinese was so difficult, I ______ never ______ it up.
A. would/taken B. will/take C. would/take D. would/have taken
24. Potatoes and onions ______from insects by new technology.
A. are preventing B. prevention is C. are prevented D. prevented
25. The grass is wet, It ______ last night.
A. used to rain B. rains C. would rain D. must have rained
26. _____the moon has no water, its surface responds to the gravitational force of the earth.
A. Although B. However C. Therefore D. Except
27. I would have been in real trouble _____ your help.
A. although B. despite C. because D. if it hadn't been for
28. Lan did very well on the exam. She ______ hard
A. studies B. would study C. probably studies D. probably studied
29. Tomatoes can be used ______ as a salad green or as a cooking vegetable.
A. such B. both C. either D. neither
30. In bacteria other organisms, _______ is the DNA that provides the genetic information.
A. it B. which C. and D. both
31. His light are out. Perhaps, he _____ to sleep.
A. went B. has gone C. goes D. is going
32. Mai didn't come to class yesterday. She ______ an accident.
A. will have had B. would have C. may have had D. can have
33. Nam was fined for speeding. He ______ so fast.
A. should drive B. should have driven C. drives D. should not have driven
34. Take Mai's address with you ______ you have time to see her when you are in Hanoi.
A. if B. when C. in case D. as
35. This is the only party ______ in my life.
A. I enjoy B. I will enjoy C. I have never enjoyed D. I've ever really enjoyed
36. Hai's car stopped on the high way. It _______ out of petrol.
A. runs B. may run C. may have run D. would run
37. My son came back home without his book. He _____ it.
A. could have lost B. was losing C. would lose D. would be losing
38. The farther a star is from us, ______ it seems to us.
A. smaller B. much small C. the smallest D. the smaller
39. Great noise is known__________deaf of many people.
A. causing B. to cause C. causes D. caused
40. My father said no other motorbike could go_______his motorbike.
A. so fast like B. as fast like C. so fast D. as fast as
I. Circle best option A, B, C or D to complete the following sentences (2pts)
1. My father .....................................run very fast when he was a child..
A. can B. could C. able to D. will able to
2. ...................robot can build house and building.
A. Doctor B. Home C. Worker D. Space
3. My teacher always advises me..............hard
A. studying B. study C. studied D. to study
4. Some students are making a lot of .........in the school yard.
A. noise B. noisy C. noisier D. noisily
5. You'd rather .................kinds of books.
A. read B. reading C. to read D. reads
6. My father is used .............up early every morning.
A. to get B. getting C. for getting D. to getting
7. Five months ago, he......................build the house.
A. be able to B. will able C. can D. could
8. Liz liked...................... the dolphin and the color of the cap.
A. either B. neither C. both D. none
9. Minh will be 18 ...........................her next birthday.
A. in B. on C. at D. with
10. He divided the cake ...................pieces
A. into B. between C. for D. during
II. Use the words given in brackets to form a word that fits in the space.(2pts)
1. Watching T.V is very interesting and I am very ...........interested.............in it. (INTEREST)
2. Is your father a .............businessman.....................? (BUSINESS)
3. Our new ..................classmate............., Hung learns English very well. (CLASS)
4. I don't like this chair. It's ..........uncomfortable............. . (COMFORT)
5. She is having a ..........medical................... check-up. (MEDICINE)
6. It's .......sunny........... today in Hanoi. (SUN)
7. We must remember to eat..............sensibly..................... (SENSE)
8. My mother ........heated.........................a pan and stir- fried the beef. (HOT)
9. Ba has a very.............painful...........tooth. (PAIN)
10. Hoa spent her..............childhood...................in the country. (CHILD)
I. Circle best option A, B, C or D to complete the following sentences (2pts)
1. My father .....................................run very fast when he was a child..
A. can B. could C. able to D. will able to
2. ...................robot can build house and building.
A. Doctor B. Home C. Worker D. Space
3. My teacher always advises me..............hard
A. studying B. study C. studied D. to study
4. Some students are making a lot of .........in the school yard.
A. noise B. noisy C. noisier D. noisily
5. You'd rather .................kinds of books.
A. read B. reading C. to read D. reads
6. My father is used .............up early every morning.
A. to get B. getting C. for getting D. to getting
7. Five months ago, he......................build the house.
A. be able to B. will able C. can D. could
8. Liz liked...................... the dolphin and the color of the cap.
A. either B. neither C. both D. none
9. Minh will be 18 ...........................her next birthday.
A. in B. on C. at D. with
10. He divided the cake ...................pieces
A. into B. between C. for D. during
II. Use the words given in brackets to form a word that fits in the space.(2pts)
1. Watching T.V is very interesting and I am very interested in it. (INTEREST)
2. Is your father a business? (BUSINESS)
3. Our new classmate Hung learns English very well. (CLASS)
4. I don't like this chair. It's uncomfortable. (COMFORT)
5. She is having a medical check-up. (MEDICINE)
6. It's sunny today in Hanoi. (SUN)
7. We must remember to eat sensibly (SENSE)
8. My mother heated a pan and stir- fried the beef. (HOT)
9. Ba has a very painful tooth. (PAIN)
10. Hoa spent her childhood in the country. (CHILD)
EXERCISES: CHOOSE THE BEST MODAL TO COMPLETE EACH OF THESE SENTENCES
1. I'm not sure. I ………… come a few minutes late.
a. may b. must c. mightn't d. needn't
2. Bring your umbrella. It ……… rain later today.
a. must b. may c. might d. b & c
3. – What are you doing this weekend \? – I haven't decided yet. I ……….. go on a picnic with my family.
a. may b. may not c. must d. needn't
4. I think we ………… be on time for the meeting after all, so don't worry.
a. must b. need c. may d. shouldn't
5. – Do you think they will come today? – Well, they ………. come today. But I think they'll want to look around first.
a. must b. needn't c. might d. can't
6. You ………. wash the car. I just had it done yesterday.
a. mustn't b. needn't c. might d. can't
7. "Have you seen Jack?" – "No. but he …….. be studying in the laboratory."
a. must b. should c. needn't d. may
8. It's secret. You ……….. let anyone know about it.
a. mustn't b. needn't c. mightn't d. may not
9. "I didn't have time for breakfast this morning." "You ……….. be very hungry now"
a. might b. may c. must d. a and b
10. She ___ be ill. I have just seen her playing basket ball in the school yard.
a. needn't b. shouldn't c. mustn't d. can't
11. Hiking the trail to the peak ______ be dangerous if you are not well prepared for dramatic weather changes. You _______ research the route a little more before you attempt the ascent.
a. might / can b. may / mustn't c. can / should d. must / needn't
12. Peter has been working for 10 hours. He _______ be very tired now.
a. needn't b. must c. has to d. should
13. He is unreliable. What he says _______ be believed.
a. cannot b. must not c. may not d. might not
14. I _______ find my own way there. You _______ wait for me.
a. should / can't b. have to / must c. can / needn't d. might/mustn't
EXERCISES: CHOOSE THE BEST MODAL TO COMPLETE EACH OF THESE SENTENCES
1. I'm not sure. I ………… come a few minutes late.
a. may b. must c. mightn't d. needn't
2. Bring your umbrella. It ……… rain later today.
a. must b. may c. might d. b & c
3. – What are you doing this weekend \? – I haven't decided yet. I ……….. go on a picnic with my family.
a. may b. may not c. must d. needn't
4. I think we ………… be on time for the meeting after all, so don't worry.
a. must b. need c. may d. shouldn't
5. – Do you think they will come today? – Well, they ………. come today. But I think they'll want to look around first.
a. must b. needn't c. might d. can't
6. You ………. wash the car. I just had it done yesterday.
a. mustn't b. needn't c. might d. can't
7. "Have you seen Jack?" – "No. but he …….. be studying in the laboratory."
a. must b. should c. needn't d. may
8. It's secret. You ……….. let anyone know about it.
a. mustn't b. needn't c. mightn't d. may not
9. "I didn't have time for breakfast this morning." "You ……….. be very hungry now"
a. might b. may c. must d. a and b
10. She ___ be ill. I have just seen her playing basket ball in the school yard.
a. needn't b. shouldn't c. mustn't d. can't
11. Hiking the trail to the peak ______ be dangerous if you are not well prepared for dramatic weather changes. You _______ research the route a little more before you attempt the ascent.
a. might / can b. may / mustn't c. can / should d. must / needn't
12. Peter has been working for 10 hours. He _______ be very tired now.a. needn't b. must c. has to d. should
13. He is unreliable. What he says _______ be believed.
a. cannot b. must not c. may not d. might not
14. I _______ find my own way there. You _______ wait for me.
a. should / can't b. have to / must c. can / needn't d. might/mustn't
1 If she............here now,she could give us some advices
a,is b,was c,were d,has been
2, I .........not loose my way if i .......you
a,would/was b,would / were c,will/am d,will/was
3,............I came,she was learning
a,when b,if c,because d,as soon as
4, I..............not be late for class if I ............you
a,would/was b,would/were c,will/am d,will/was
5, If I were you, I would .............her
a,marry b,to marry c,married d,marrying
6, You................the exam unless you study hard
a,will fail b,would fail c,will pass d,would pass
7, If it.................I shall take an umnrella with me
a,rain b,rains c,to rain d,rained
8, I...................be able to give you the answer if you asked me tomorrow
a,would b,will c,should d,might
9, If i.......................the teacher, I would give an aesier test
a,was b,were c,is d,am
10, If i were you, I................visit them without an invitation
a,won't b,hadn't c,don't d,wouldn't
11, If you want.................there before dark, you should start at one
a,get b,to get c,getting d,got
12, Ask him..........in, don't keep him standing at the door
a,come b,came c,to come d,coming
13, I don't know him but he looks as if he....................be his father
a,can b,could c,would d,should
14, If it....................fine, I shall go out
a,was b,will be c,is d,were
15, If you look hard enough, you....................it
a,will find b,will be finding c,are finding d,found
1. If she_____here now,she could give us some advices
a.is
b.was
c.were
d.has been
2. I_____not loose my way if I _____you
a.would/was
b.would/were
c.will/am
d.will/was
3._____I came,she was learning
a.when
b.if
c.because
d.as soon as
4. I_____not be late for class if I_____you
a.would/was
b.would/were
c.will/am
d.will/was
5. If I were you, I would_____her
a.marry
b.to marry
c.married
d.marrying
6. You_____the exam unless you study hard
a.will fail
b.would fail
c.will pass
d.would pass
7. If it_____I shall take an umnrella with me
a.rain
b.rains
c.to rain
d.rained
8. I_____be able to give you the answer if you asked me tomorrow
a.would
b.will
c.should
d.might
9. If I_____the teacher, I would give an aesier test
a.was
b.were
c.is
d.am
10. If i were you, I_____visit them without an invitation
a.won't
b.hadn't
c.don't
d.wouldn't
11. If you want_____there before dark, you should start at one
a.get
b.to get
c.getting
d.got
12. Ask him_____in, don't keep him standing at the door
a.come
b.came
c.to come
d.coming
13. I don't know him but he looks as if he_____be his father
a.can
b.could
c.would
d.should
14. If it_____fine, I shall go out
a.was
b.will be
c.is
d.were
15, If you look hard enough, you_____it
a.will find
b.will be finding
c.are finding
d.found
7. Hurry up, there’s …… time left.
A. a little B. a few C. little D. few
8. For lunch, you may have _________ fish or chicken.
A. both B. neither C. not only D. either
9. The clerk said she was tired …… hearing complaints day after day.
A. with B. of C. about D. for
10. You and I are busy right now, ……?
A. aren’t I B. aren’t we C. we aren’t D. aren’t you
11. We arrived …… to have some coffee before class.
A. enough early B. early enough C. too early D. early too
12. “What are you doing?”
“I …… the flowers. They …… wonderful!”
A. am smelling / smell B. smell / smell
C. am smelling / are smelling D. smell / are smelling
13. Do you know _________ ?
A. who how many people go on Sundays to church
B. who go to church on Sundays how many people
C. how many people who go on Sundays to church
D. how many people who go to church on Sundays
14. We watch the cat ________ the tree.
A. climbed B. climb C. had climbed D. was climbing
15. If we had known your new address, we ________ to see you.
A. came B. will come C. would come D. would have come
16. He looked forward to ________ his first pay packet.
A. receive B. have received C. be receiving D. receiving
17. “Let’s go dancing, _________?” – “Yes, let’s.”
A. won’t we B. don’t we C. do we D. shall we
18. I wish I _________ all about this matter a week ago.
A. knew B. know C. had known D. B & C are correct.
19. He was _________ he could not wake up.
A. very tired that B. such tired that C. too tired that D. so tired that
20. Joan asked _________.
A. if there was coffee B. there was coffee
C. was there coffee D. where was the coffee
21. I ____ my house ____. That is why there is all this mess.
A. had – paint B. have – paint C. am having – painted D. had had - paint
22. He was made _________ for two hours.
A. to wait B. wait C. waiting D. waited
17. “Where are my jeans?” “They _________ at the moment. Sorry.”
A. are washing B. were washed C. are washed D. are being washed
23. It took weeks to get used to …… someone else around.
A. have B. having C. had D. has
24…… he comes in half an hour, I shall go alone.
A. If B. Unless C. Because D. When
“Did you like the new French movie?”
“My wife liked it but I was a little …….”
A. boring B. bored C. boredom D. bore
25. I want to have my suit …… . I’m going to a wedding on Saturday.
A. cleaned B. cleaning C. clean D. to clean
26. He turned …… the light so as not to waste electricity.
A. off B. of C. on D. down
7. Hurry up, there’s …… time left.
A. a little B. a few C. little D. few
8. For lunch, you may have _________ fish or chicken.
A. both B. neither C. not only D. either
9. The clerk said she was tired …… hearing complaints day after day.
A. with B. of C. about D. for
10. You and I are busy right now, ……?
A. aren’t I B. aren’t we C. we aren’t D. aren’t you
11. We arrived …… to have some coffee before class.
A. enough early B. early enough C. too early D. early too
12. “What are you doing?”
“I …… the flowers. They …… wonderful!”
A. am smelling / smell B. smell / smell
C. am smelling / are smelling D. smell / are smelling
13. Do you know _________ ?
A. who how many people go on Sundays to church
B. who go to church on Sundays how many people
C. how many people who go on Sundays to church
D. how many people who go to church on Sundays
14. We watch the cat ________ the tree.
A. climbed B. climb C. had climbed D. was climbing
15. If we had known your new address, we ________ to see you.
A. came B. will come C. would come D. would have come
16. He looked forward to ________ his first pay packet.
A. receive B. have received C. be receiving D. receiving
17. “Let’s go dancing, _________?” – “Yes, let’s.”
A. won’t we B. don’t we C. do we D. shall we
18. I wish I _________ all about this matter a week ago.
A. knew B. know C. had known D. B & C are correct.
19. He was _________ he could not wake up.
A. very tired that B. such tired that C. too tired that D. so tired that
20. Joan asked _________.
A. if there was coffee B. there was coffee
C. was there coffee D. where was the coffee
21. I ____ my house ____. That is why there is all this mess.
A. had – paint B. have – paint C. am having – painted D. had had - paint
22. He was made _________ for two hours.
A. to wait B. wait C. waiting D. waited
17. “Where are my jeans?” “They _________ at the moment. Sorry.”
A. are washing B. were washed C. are washed D. are being washed
23. It took weeks to get used to …… someone else around.
A. have B. having C. had D. has
24…… he comes in half an hour, I shall go alone.
A. If B. Unless C. Because D. When
“Did you like the new French movie?”
“My wife liked it but I was a little …….”
A. boring B. bored C. boredom D. bore
25. I want to have my suit …… . I’m going to a wedding on Saturday.
A. cleaned B. cleaning C. clean D. to clean
26. He turned …… the light so as not to waste electricity.
A. off B. of C. on D. down
22. I’m afraid I _______ attend the festival next week, I am going to have final-term test in English.
A. won't be able to B. can C. could D. will be able to
23. Neil Armstrong ______ set his foot on the Moon for the first time in 1969.
A. can B. was able to C. could D. will be able to
24. When we went into the house, we ______ smell burning.
A. can B. could C. was able to D. will be able to
25. My brother ______ read and write when he was just 4 years old.
A. can B. will be able to C. was able to D. could
26. Can you speak up a little bit? I ______ hear you clearly.
A. can B. can’t C. could D. couldn't
27. When I was a child, I _________ understand adults; and now I am an adult, I ______ understand children.
A. could/could B. could/can C. can/could D. can/can
28. I _______ cook-tasty food now.
A. can B. can't C. could D. couldn't
29. They ______ to train in the gym in two days, then they will go on holiday.
A. could B. can C. will be able D. won't be able
30. ______ you be able to take part in the school prom next week? It will be really wonderful.
A. could B. can C. will D. won't
1, You just have dinner without waiting for me. I (can, may,should,would) worl very hard today.
2,I (ought to, would,might,can) be delighted to show you round the factory.
3,Leave early so that you (didn't, won't, shouldn't, mustn't) miss the bus.
4,Unless he runshe (will, mustn't, wouldn't,won't) catch the train.
5, (will, may, might,maybe) you be in Rome tonight.
6, Jeanette did very badly on the exam. She (must have studied,should have studied, could have studied) harder
chọn đáp án đúng:
1.Don't be silly!That........................ posibly be Rivaldo!
a)mustn't b)shouldn't c)won't d)can't
2.No sooner had we started the game,................ it began to rain.
a)than b)then c)that d)and
3.I................. be interested in playing badminton as a child.
a)could b)ought to c)might d)used to
4.They've told you time and time.................. not to go out at night.
a)to b)over c)again d)before
5.Sorry I'm late, but I ............................ feed my little son before leaving home.
a)needs b)must c)had to d)was to
6.Smith writes very quickly. He's.............................. finished his essay.
a)already b)been c)for d)yet
7. What are you going to do?-I don't know. I haven't made................... my mind yet.
a)on b)at c)in d)up
8.I've........................ to Paris. I went there in March.
a) been b)gone c) just d)yet
9.What did the girl say......................?
a)at you b)for you c)you d)to you
1.Don't be silly!That........................ posibly be Rivaldo!
a)mustn't b)shouldn't c)won't d)can't
2.No sooner had we started the game,................ it began to rain.
a)than b)then c)that d)and
3.I................. be interested in playing badminton as a child.
a)could b)ought to c)might d)used to
4.They've told you time and time.................. not to go out at night.
a)to b)over c)again d)before
5.Sorry I'm late, but I ............................ feed my little son before leaving home.
a)needs b)must c)had to d)was to
6.Smith writes very quickly. He's.............................. finished his essay.
a)already b)been c)for d)yet
7. What are you going to do?-I don't know. I haven't made................... my mind yet.
a)on b)at c)in d)up
8.I've........................ to Paris. I went there in March.
a) been b)gone c) just d)yet
9.What did the girl say......................?
a)at you b)for you c)you d)to you
Choose the best answer for each of the following sentences .
1. She was very sad ______ good marks in the final test.
A. not get B. not to get C. to not get D. not getting
2. My sister has decided to lose weight, so she is living ______ oranges for a week.
A. with B. on C. in D. by
3. When I ______ school, I am going to work in a factory .
A. begin B. study C. leave D. learn
4. What can we do to prevent people ______ throwing drink cans away?.
A. in B. of C. on D. from
5. We have not seen each other ______last Sunday.
A. for B. since C. on D. in
6. Excuse me! I am doing my homework. ______ turning down your radio a bit?.
A. Would you please B. Can you C. Could you D. Would you mind
7. You should work ______ for the coming exam.
A. hard B. hardly C. more hardly D. more hard
8. He found a watch when he ______ in the street.
A. walked B. has been walking C. was walking D. has walked
9. My uncle used to live ______ a farm when he was young.
A. in B. at C. during D. on
10. Millions of Christmas cards ______every year.
A. send B. are sent C. are sending D. was sent
Choose the best answer for each of the following sentences .
1. She was very sad ______ good marks in the final test.
A. not get B. not to get C. to not get D. not getting
2. My sister has decided to lose weight, so she is living ______ oranges for a week.
A. with B. on C. in D. by
3. When I ______ school, I am going to work in a factory .
A. begin B. study C. leave D. learn
4. What can we do to prevent people ______ throwing drink cans away?.
A. in B. of C. on D. from
5. We have not seen each other ______last Sunday.
A. for B. since C. on D. in
6. Excuse me! I am doing my homework. ______ turning down your radio a bit?.
A. Would you please B. Can you C. Could you D. Would you mind
7. You should work ______ for the coming exam.
A. hard B. hardly C. more hardly D. more hard
8. He found a watch when he ______ in the street.
A. walked B. has been walking C. was walking D. has walked
9. My uncle used to live ______ a farm when he was young.
A. in B. at C. during D. on
10. Millions of Christmas cards ______every year.
A. send B. are sent C. are sending D. was sent
Cái này của lớp 5 hay sao ý nhưng nhìn nó dễ lắm
1. When the fog lifts, we _______where we are. *
A. could see
B. will be able to see
C. must have seen
D. are seeing
2. The swimmer was very tired, but he________the shore before he collapsed. *
A. was able to reach
B. can reach
C. could reach
D. has reached
3. If a letter comes for me, ________you please forward it to this address. *
A. shall
B. could
C. must
D. should
4. Laura, you and the kids just have dinner without waiting for me. I ______work very hard today. *
A. can
B. may
C. should
D. would
5. Leave early so that you________miss the bus. *
A. didn't
B. won't
C. shouldn't
D. mustn't
6. Twenty years ago, David_______speak Arabic fluently. Now he's forgotten a lot. *
A. could
B. might
C. needed
D. must
7. Jessica hasn't made up her mind about where to go to school. She________attend Duke University. She just doesn't know yet. *
A. mustn't
B. may not
C. needn't
D. can't
8. This box isn't as heavy as it looks. You ________help me with it. Thanks anyway for offering to help. *
A. must
B. mustn't
C. might
D. needn't
9. Yesterday everyone in the office________leave the building for a fire drill. I am glad it wasn't a real fire. *
A. may
B. might
C. must
D. mustn't
10. You________play loud music at night. The neighbors will call the police. *
A. mustn't
B. needn't
C. might not
D. couldn't
11. You________stand up. There are a lot of seats available on the bus. *
A. couldn’t
B. mustn't
C. needn't
D. might not
12. People who use public parks_______clean up after themselves. *
A. must
B. may
C. ought
D. might
13. This library book is overdue. I________better return it today. *
A. need
B. must
C. might
D. had
14. Our company provides free advice on the use of our products. You_______pay us. *
A. must
B. have to
C. needn't
D. mustn't
15. Whatever_______come, I will always be by your side. *
A. must
B. may
C. could
D. need
16. "________you hand that book, please?" "Sure. Here it is." *
A. Could
B. Should
C. Must
D. May