Ответ:

1) must

2) must

3) must

4) mustn't.

5) must

6) mustn't

Ответ:

1. You must do your homework

2. I must brush my teeth

3. You must clean them.

4. You mustn't drop litter

5. I must tidy my room

6. You mustn't play on the road

Объяснение: