1. It is a good thing to keep the house clean and tidy. 

2 ( mik nghĩ hình như bạn sai đề bài chỗ "an " , mik nghĩ là "a" mới đúng ) 

nếu như thế thì câu 2 là

It is a dangerous electrical socket to put into the knives ( viết sai từ knife số nhìu kìa)

3. We mustn't let the children play in the kitchen because it is a dangerous place.

4. Young children don't understand that many household objects are dangerous.

5. The student ought to learn their lesson carefully before the exam. 

6. Don't worry so much ! The children can look after themshelves.

7. Remember to turn off the light  in order to save electricity.

phần gạch ngang là light ko phải night nhé bạn! light là đèn còn night là đêm 

8.ko hiểu đề cho lắm 

9.ko hiểu j luôn 

10. You have to keep all dangerous objects out of children 's reach. 

Chúc bạn hok tốt! ~~~~

Cảm ơn bạn ! 

Bạn chỉ ra được lỗi mà mình đánh sai luôn 

TRANSFORMATION 

1. It is good thing for student to keep the house clean and tidy

-> Student ought                to keep the house clean and tidy                                               

2. It is not a good idea for you to put so much salt in the soup 

-> You ought                 not to put so much salt in the soup                                                                         

3. It is nececessary for you to do your housework alone 

-> You have                                to do your housework alone                                                    

4. No one helps Nam clean hí bicycle 

-> Nam            is not helped to clean his bicycle                                                                                         

5. You have to cook dinner on your own 

-> You              ought to cook dinner on your own                                                                                  

6. It is not necessary for Lan to water that tree every day 

-> Lan doesn't           need  to water that tree every day                                                          

7. These object are very dangerous so we mút put them in locked cupboards

-> Because                     we mút put These object in locked cupboards,they are very dangerous                         

8. You aren't allowed to make noise in the library 

-> You must                  not make noise in the library                                                                                     

9. Ba doesn't have a clock so he goes to school late

-> Because                ba goes to school late,he doesn't have a clock                                                              

10. Above the desk there í a bookshelf

-> There              is a bookshelf under the desk                           

Reported question 

1."Have you studied reported speech before ? She asked me

She asked me ................if I had studied reported speech before....................

2."Where is my umbrella ? She asked 

She asked ..........me where her umbrella was...............................................

3."He asked , "Do I have to do it ?"

She asked .........me if she had to do it....................................

4."How are you ?"Martin asked us

Martin asked us .................how we were............................

5."Has Caron talked to Kevin ?" my frienh asked me

My friend asked me ...............if Caron had talked to Kevin........................

6."How do you know that ?" she asked me

She asked me ............How I knew that....................................

7."Are you going to cinema ?" He asked me

He want to know .....................if I was going to cinema......................

8."What are they doing ?" She asked 

She wanted to know ...........what they were doing........................

9."Where have you been ?" The mother asked her daughter

The mother asked her daughter........where she had been........

10."Which dress do you best ?" She asked her boyfriend

She asked her boyfriend .......which dress he li ked best....................

rewrite the sentences:

1. she last wrote to me seven months ago (for)

=>She hasn't written to me for 7 months

2. I'd rather read newspapers than watch tv (to)

=>I prefer reading newspapers to watching TV

3. "are you leaving for ha noi tomorrow?" he said to me (asked)

=>He asked me if I was leaving for HN the next day

4. marconi invented radio about a hundred years ago (was)

=>The last time Marconiinvented radio was about a hundred years ago

5. "do these clothes be long to you ?" Liz said to me (if)

Liz asked me if those clothes belonged to me

6. did you usually wear jeans when you were young (used)

Did you use to wear  jeans when you were young ?

7. we have never been to Viet's native village before (time)

This is the first time we have  been to Viet's native village

8. shall we use gas instead of burning coal (using)

How about usinggas instead of burning coal 

9. my sister locked after our children when we were away (took)

my sister took care of our children when we were away

1. .......to me for seven .............

2. .......father to read.............

3. .......tomorrow?" Asked he said......

4. ......radio was about a...........

5. ...........?" If Liz said to me?

6. Did you used usually...............

7. .............never been time to Viet's...............

8. ........instead using of..........

9. ..........We were took away.

10. You always forgot.................

1. He was very sick. He couldn't see anything.
-> He was so sick that he couldn't see anything.

2. It was very dark. He couldn't see anything.
-> It was so dark that he couldn't see anything.

3.  He has very wide knowledge. We can't help admiring him.
-> He has such a wide knowledge that we can't help admiring him.

4. His conduct is very good. All his teacher love him.
-> His conduct is so good that all his teacher love him
5. Mary has beautiful voice. We all to hear her sing.
-> Mary has such a beautiful voice that we all to hear her sing
6. John is still very weak. He can't walk without a sk.
-> John is still so weak that he can't walk without a sk
7. My father has a very good health. He seldom takes any medicines.
-> My father has such a good health that he seldom takes any medicines
8. There is too much noise. We can't learn our lesson.
-> There is so much noise that we can't learn our lesson
9. My friend is very strong. He can lift up the table himself.
-> My friend is so strong that he can lift up the table himself
10. Bill is an inteligent boy. He is always at the top of his class.
-> Bill is such an intelligent boy that he is always at the top of his class

1.He was so sick that he couldn't see anything.

2.It was so dark that he couldn't see anything.

3.He has such a wide knowledge that we can't help admiring him.

4.His conduct is so good that all his teacher love him.

5.Mary has such a beautiful voice that we all to hear her sing.

6.John is still so weak that he can walk without a sk.

7.My father has such a good health that he seldom takes any medicines.

8.There is so much noise that we can't learn our lesson.

9.My friend is so strong that he can lift up the table himself.

10.Bill is such intelligent boy that he is always at the top of his class.

~Hok tốt~

TV is bringing not only information but also entertainment

trả lời 

Information /bringing /entertainment /also /is/only /but/TV/not

 => TV is not only entertainment but also bringing information

hc tốt

Đúng hết r mak               

Educated in the UK, his qualifications are widely recognized in the world of professionals. Câu này đúng rồi ko cần sửa

1.electricity

2. Chemicals

3.community

4.Destroying 

5.Electrical

6.Electrician 

7.Dangerous 

8.Carelessly

9.Unsafe 

10.Safely 

11.Destructs

12.Suitable 

13.Be careful

14.Injury 

15.Locker

16.Injured 

17.Suitable 

18.Cooking

19.Houses

20.Steaming 

Sai thì thông cảm

WORD FORM 

1. Don't leave the light on. It waste                electricty                                     (electric)

2. Every day, factories release thousands of tons of poisonous                    chemmicals                     into the atmosphere ( chemistry)

3. Most teenagers take part in                          community                 service (communal)

4. Many people are very concerned about the               destroying                            of the rainforest (destroy)

5. I go to school by                  electrcal                      bike (electrify)

rối quá còn đâu bn tự lm đi mk hoa mắt òi :>

(x - 1)² - (x + 1)² = 5 - 6x

<=> x² - 2x + 1 - x² - 2x - 1 = 5 - 6x

<=> -4x = 5 - 6x

<=> -4x + 6x = 5

<=> 2x = 5

<=> x = \(\frac{5}{2}\)

(x-1-x-1)(x-1+x+1)=5-6x

-2.2x=5-6x

2x-5=0

x=5/2