Bai 3:

1, Parents should instill in their children a respect for their country’s tradition and culture.

2, Everyone should go home for a family reunion regularly.

3, You should travel more to broaden your horizon.

4, What should Jim do to study better?

5, We should not go on our vacation because it’s very far from our location.

6, They should not be rude to other people.

7, You should pay more attention to what your parents say.

8, Whenever you go, you should pay close attention to the manner and etiquettes there.

Bai 4:

1, mustn’t

2, mustn’t

3, mustn’t

4, must

5, must

6, must

7, mustn’t

8, mustn’t

9, must

10, must

11, mustn’t

12, mustn’t

13, must

14, mustn’t

15, mustn’t