7. If I had free time, I could go with you.

8. After they had provided food, they cleared up the debris.

VI.

1. doing = > to do

2. many = > much

3. polluted = > pollution

4. less = > fewer

5. don't dump = > won't dump

6. playing = > is playing

7. had had = > were having

8. không có lỗi

9. destroyed = > were destroyed

7. If I had free time, I could go with you.

8. After they had provided food, they cleared up the debris

***

1. C (to do) - Cấu trúc: It takes sb time to V

2. A (much) - Câu hỏi để hỏi về giá tiền: How much does it cost?

3. B (pollution) - pollution[n.]: sự ô nhiễm

4. B (fewer) - FEWER được dùng với các danh từ đếm được

5. B (won't dump) - Câu điều kiện loại 1: If S V, S will/can/may/... V

6. A (is playing) - Thì hiện tại tiếp diễn: S am/is/are V-ing

7. D (were having) - Hai hành động trong quá khứ, hành động xen vào chia QKĐ, hành động xảy ra chia QKTD.

8. C (work) - go to work: đi làm

9. B (were destroyed) - Câu bị động thì QKĐ: was/were PII