--- It rained cats and dogs this morning. I’m glad we took an umbrella.--- Yeah, we would have got wet all over if we__________ .

The teacher requested that we ______ the classroom after using it.

(2012·全国卷Ⅰ)I ________ use a clock to wake me up because at six o'clock each morning the train comes by my house.

Could I do some explanations? Ito call on you yesterday, but someone came to see me justwhen I was about to leave.

But for the heavy traffic, the police ___ the thieves who tried to escape in the stolen car.