Поставьте в пропуски must, mustnt, have to, dont have to, can or cant
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 youre busy, you know
B:No, Im happy to help- but I...... forget to write my report for tomorrow
4) A:Im afraid I..... go out with you tonight - I ...... visit my parents
B: ...... I come with you,then?

1) have to / dont / have to / must  
2) dont have to
3) dont have to / mustnt
4) mustnt / have to / must

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