Question

Поставьте в пропуски must, mustn't, have to, don't have to, can or can't 
1) A:Do we ......finish this exercise in class?
B: No, you..... . You ..... finish  it at home if you like - but you ..... finish it before the next lesson!
2)A: I hate waitingfor the bus in the morning!
B: Fortunately, I ...... take the bus, because I go to school by bike.
3) A: You ..... help me with the washing-up if you're busy, you know 
B:No, I'm happy to help- but I...... forget to write my report for tomorrow
4) A:I'm afraid I..... go out with you tonight - I ...... visit my parents 
B: ...... I come with you,then?

Answer 1

1) have to / don't / have to / must  
2) don't have to
3) don't have to / mustn't
4) mustn't / have to / must