I wonder if it _________ tomorrow. –Don’t worry. If it _________, we’ll stay at home.

How often does the train run to Beijing —– ________ twenty minutes.

eens don’t get enough sleep because they havetoo much homework to do, which _______ them up at night．

We were about to start out________ our friends calledus up from Shanghai.

I can’t play with you. I have . homework to do.