1. He (go) goes to school every day .

2. A lot of people (go) go to work by car .

3. John usually( take) takes the bus to school .

4. He (play) is playing volleyball but he (not enjoy ) doesn't enjoy it.

5. School children (wear ) wear uniform on Monday.

6. Mary often (go) goes to work on foot .

7. Bad students never (work ) work hard .

8. They ( not be ) are not doctors.

sorry mik hok bt, very sorryyy

b. 100 bn nhé :)

a,b khác 0, a/20=b/21. Vậy nó thuộc tỉ lệ thức nào?

hơi khó nhaa

rất hay, thanks