1 B

2 B

3 C

4 A

5 B

6 B

1 let => let's 

2 plant => planting

3 joining => join

4 us buy => we buy

5 helping => help

6 How about we organize a car wash?

7 Let's take part in a talent show

8 We should organize a fair craft

9 How about donating old books for poor children?

10 I think we should raise money for planting trees

1 C

2 D

4 A

5 A

6 D

7 A

8 B

9 D

10 D 

Đáp án C