`IV`

1. fall

2. meant

3. their

4. have

5. studies

6. forget

7. of

8. give

9. comparison

10. space

`I`

1. In Australia, you mustn’t to comment on a person’s accent.

(bỏ "to")

2. In my family, children has to get permission before leaving the dining table.

`=>` In my family, children have to get permission before leaving the dining table.

3. When I came, the whole family is having dinner around a big dining table.

`=>` When I came, the whole family was having dinner around a big dining table.

4. Lang Lieu couldn't buy any special food while he has very poor.

`=>` Lang Lieu couldn't buy any special food because he has very poor.

D) (1) bỏ to

(2) has to--> have to

(3) is having--> was having

(4) while--> because