Have you seen the boys _______ “Little Apple”T hat’s such a beautiful scene that I dare not have my eye _____ on it.

The plane for Yunnan will______ in two hours. Let’s goto the airport as soon as possible.

Ladies and gentlemen, please fasten your seat belts .The plane _____

Scientists are convinced _____ the positive effect of laughter _____ physical and mental health.[ ]

Here you are at last! What kept you so long—Sorry, I’m late. But do you know what greatdifficulty I have ______ your house.