1.have to
2.must

3.must
4.have to
5.has to

6.must
7.have to 
8.have to

9.has to 
10.must

Đáp án:

Giải thích các bước giải:

 1.Vietnamese children have to  wear uniform when they go to school.

2. Last night my sister was ill . We had to/must call the doctor.

3.I have bad toothache . I must make an appointment with the dentist.

4. I don't want to have to wait in a queue for ages.

5. She has to  work on Saturday morning.

6. When you come to California, you  must come and see us soon.

7. This is a terrible party . We must  go home.

8. If there are no taxis we'll have to walk.

9. Daniel must go to the bank . He hasn't any money.

10. You really have to/must hurry up , Vicky . We don't want to be late