Dad, why must I stop______ computer games? – For your health， my boy.

What do you think of “Where are we going ,dad”, Mum?—Perfect! Though I have seen it once, I want to see it _____ time.

You can have a pen, _____him, he can’t have one.[ ]

What’s wrong with you, sir? — My flight ______ ten minutes ago. What should I do?

Who taught ______ math last year?