Part 1: Rewrite each sentence beginning as shown, so that the meaning remains the same.
Example: He wrote the letter in two hours.
It took him two hours to write the letter.
1. The keepers feed the lions at 3 pm every day.
The lions ................................................................................................................................
2. We got lost because we didn't have a map.
If we ........................................................................................................................................
3. I would prefer you to deliver the sofa on Friday.
I would rather.........................................................................................................................
4. The bridge was so low that the bus couldn't go under it.
It was .......................................................................................................................................
5. That was a silly thing to say.
What ........................................................................................................................................
6. We've run out of tea.
There........................................................................................................................................
7. I last saw him when I was a student.
I haven't ..................................................................................................................................
8. Susan was too excited to sleep.
Susan was ...............................................................................................................................
9. Robert has not had a job for two years.
Robert has been .....................................................................................................................
10. She will complete the work only she is paid extra.
She will not ........................................................................................................................
Part 2 Use the words in the brackets to combine the following sentences.
1. All the students love the principal. He is very kind. (because of)
.................................................................................................................................
2. I have forgotten the tickets. I’m sorry for it. (having)
................................................................................................................................
3. I saw it with my own eyes. I believed it. (if)
................................................................................................................................
4. The house at the end of the street has been sold. It has been empty for years. (which)
.............................................................................................................................
5. It's a pity he doesn't take the doctor's advice. (wish)
............................................................................................................................
Part 3 : A friend of yours has written to you, asking for some advice. He wants to visit
your country for three weeks this summer and would like to know which places to visit,
where to stay, what sights to see, and what clothes to bring. Write to him, giving as many
suggestions as you can and mentioning any national customs that may seem strange to
him. (about 200 words)
a) Phương trình hoá học của phản ứng :
2Al+3H2SO4→Al2(SO4)3+3H22Al + 3{H_2}S{O_4} \to A{l_2}{(S{O_4})_3} + 3{H_2}2Al+3H2SO4→Al2(SO4)3+3H2
Phương trình hoá học cho biết : cứ 2 nguyên tử AI tác dụng với 3 phân tưH2SO4, tạo ra 1 phân tử Al2(SO4)3 và 3 phân tử H2.
b) Nếu có 6,02.1023 nguyên tử AI sẽ tác dụng với 6,02.1023×32(=9,03×1023)6,{02.10^{23}} \times {3 \over 2}( = 9,03 \times {10^{23}})6,02.1023×23(=9,03×1023)
phân tử H2SO4, tạo ra 6,02.1023×12(=3,01×1023)6,{02.10^{23}} \times {1 \over 2}( = 3,01 \times {10^{23}})6,02.1023×21(=3,01×1023) phân tử Al2(SO4)3và
6,02.1023×32(=9.03×1023)6,{02.10^{23}} \times {3 \over 2}( = 9.03 \times {10^{23}})6,02.1023×23(=9.03×1023) phân tử H2.
c) Đáp số : 4,515.1023 phân tử H2SO4
1,505.1023 phân tử Al2(SO4)3
4,515.1023 phân tử H2