If there are _______ people driving, there will be _______ air pollution.—Yes, the air will be fresher.

What’re you doing, Jack?—I’m looking for some information about famous people ______ I need to make a poster.

How long has your brotherthe computer? — About two weeks.

In face of failure, it’s the most important to _______ a positive state of mind.

I was late for school this morning, because the bus was too＿for me to get on.