I

1. A 

2. B

3. B

4. C

5. D 

6. C

7. A

8. A

9. D

10. A

11. C

12. B

II

1. Having switched off the lights, we went to bed

2. Having drunk too much, he didn't drive home himself

3. Someone had started a fire in the forest. Tom admitted having done it

4. He denied having taken responsibility for the project

5. After having made all necessary preparations, we put our plan into action

6. After having watched the documentary about wildlife, I made a donation to an environment society

7. After having eaten my evening meal, I decided to go for a walk

8. không nhớ cấu trúc

9. After having finished all my homework, I watched my favourite film on TV

10. Because of not having seen him for ages, I didn't recognize him

$Xin - Hay - Nhất$

I/

1. A (admit + V_ing/ Having PII: thừa nhận đã làm gì)

2. B (mention + V_ing/ having PII: đề cập đến việc gì, trong tường hợp này câu ở dạng bị động- "đã bị thương)

3. B (apologize for V_ing /having PII: xin lỗi vì đã làm gì)

4. D (deny + V_ing/ having PII: phủ nhận đã làm gì)

5. D 

6. C (enjoy + V_ing, trẻ em thì thích được mang đi câu cá- bị động)

7. C (of + V_ing/having PII: về việc gì)

8. A (rút gọn mệnh đề quan hệ, có "the firts" => dùng to V)

9. A (dùng having done để nhấn mạnh việc đã làm rồi)

10. A (tương tự câu 9)

11. C (tương tự câu 9)

12. B (sau after thường là V_ing/having PII)

II/

1, Having switched off the lights, we went to bed.

2, Having drunk too much, he didn;t drive home himself.

3, Someone had started a fire in the forest. Tom admitted having done it.

4, He denied having taken responsibility for the project.

5, After having made all necessary preparations, we put our plan into action.

6, After having watched the documentary about wildlife, I made a donation to an environment society

7, After having eaten my evening meal, I decided to go for a walk.

8. Because of having been told about the dangers of chemical fertilizers, the farmers turned into bio-fertilizers.

9. After having finished all my homework, I watched my favourite film on TV.

10. Because of not having seen him for ages, I didn't recognize him.