Помогите с заданием.

IV. Complete the sentences using must, mustn’t, (don’t) have to, can’t, ought to, shouldn’t, had better.
1) You look very pale. You … take some aspirin and go to bed.
2) Look at this phone bill! I really … try to make fewer phone calls.
3) You … walk the dog again. John walked him an hour ago.
4) You … be loud during the lesson.
5) I’m afraid you … park here.
6) I can’t meet my friends in the evening because I … do my homework.
7) You … take all this waste paper to the recycling bin.
8) This is an old-fashioned school. All students … wear a uniform.
9) You … throw away all this paper. It can be recycled.