You ............. hand in your homework on Tuesday or your ...

★ Modal Verbs - Obligation

You …………. hand in your homework on Tuesday or your mark will be zero.

A. must

B. mustn’t

C. don’t have to

D. doesn’t have to

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You …………. put salt in her food; the doctor said she can’t eat salt.

A. don’t have to

B. doesn’t have to

C. mustn’t