One of our rules is that every student _______ wear school uniform while at school.

Can you imagine that a smart man like him_____ make such a stupid mistake?

I told your friend how to get to the hotel,but perhaps I___have driven her there.

—May I speak to the patient now?—No, you _____. He is too weak now.

Mike is often absent from class.” “Tell him he _________ answer for it if he goes on behaving like that.”