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ВСТАВИТЬ "mustn"t , don"t/doesn"t have to 
 
1) I__go to school on Sundays
2) We __ make noise.Me little sister is asleep
3) I__spend much money 
4) I__ do this exercise in writing
5) He__ forget to mail this letter tomorrow
6) You__come to the party 
7) You __ to eat it if you don"t like it 
8) They __to study music this year

1. don't have to2. mustn't3.mustn't4. don't have to5. mustn't6. doesn't have to7. doesn't have to8. doesn't have to