=>
I/
1. D bởi vì
2. A Let's + V
3. B go on : tiếp tục
4. A laugh là động từ -> cần trạng từ
5. B vì vậy
6. A be adj that S V
7. D look for : tìm kiếm
8. B giảm
III/
1. I suggest meeting inside the center, at the cafe's corner.
-> suggest Ving : đề xuất, gợi ý
2. It's very important to keep the environment clean.
-> be adj to V
3. Unless someone puts the coal in, the fire will go out.
-> unless = if not
4. How about planting some trees around your house to get more fresh air?
-> Why don't you/we ~ How about Ving?