XI.
1. F
2. E
3. D
4. A
5. B

* Bài tiếp:
1. Mrs. Tuyet advised Nga not to lend him any more money.
2. To everyone’s surprise, Geoff left the party early.
3. It was too late to do anything.(Or:It was too late for anything to be done.)
4. Can’t you offer a better price?
5. I used to go to church every Sunday.
6. A letter was sent to my friend in London last week.
7. I haven’t seen him since I was a student.
8. She reminded me to bring my passports with me when I went abroad.
9. Would you mind not smoking in the ward?
10. Because he was lazy, he failed the exam.

XIII.
1. I stayed up late last night so as to finish my homework.
2. The thick fog made it impossible for me to drive to work.
3. This is the first time Nick has been to Vietnam.
4. Mr. Lam doesn’t teach the same subject as Mr. Hai.
5. I don’t want to see him tomorrow.
* Những từ gạch chân là những từ ngta cho để mình viết lại câu đấy 

* Bài cuối - XIV
1. Instead of reusing plastic bags, we should use cloth bags.
2. Will you have a look at the house for me while I am on holiday?
3. We hope to give more green color to the town and earn some money for our group.
4. “Friends of the Earth” is an organization to protect our planet.
5. It was brave of him to jump into the river to save the child.