I. 

1. Because of Nhung's younger sister's illness, she didn't go to the cinema with her friends.

2. The city was struck and destroyed completely thousands of buildings and houses by the earthquake.

3. By whom did this poem written in the 19th century?

4. If Minh were hard working, he wouldn't often get bad marks.

II.

1. If I were you, I would recycle these carrier bags.

2. The pilots' strike was suddenly so all the flights had to be cancelled.

3. The environment is polluted cause birds and plants die.

4. The food is contaminated leads to poor people's health.

III.

1. have been visited

2. has

3. symbolizes

4. is celebrated

5. have visited

6. are repaired

XI.

1. The bad weather made it impossible for the plane to touch down.

2. My brother is fond of Science fiction books.

3. Peter said that he had already seen  the New-Tech Exhibition.

4. They announced that the plane would be leaving in thirty-five minutes.

5. All household chores will be easily handled by a robot in the near future.

6. Rhomas Edition made up his first laboratory facility in 1876.

7. Mark told me that we should go to Science and Technology Fair.

8. It's not worth persuading him to go with us.

9. Why has no one come out a way to make aircraft quieter?

10. By the time we arrived at the cinema, the film had finished.

- Thieukhue -