Teachers _______________ check their social networks while they are teaching. ...

★ Modals of Obligation

Teachers _______________ check their social networks while they are teaching. They will get in trouble!

A. can

B. should

C. don’t have to

D. can’t

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You _______ bring your passport for domestic flights. No one asks for it.

A. need to

B. don’t need to

C. must

D. mustn’t