Tom. Why do you look so tired? — Because I often study late ______ 10 o’clock at night.[ ]

I find difficult for Tom to reach that picture.He is a little short.

_____ have you been swimming? For five years.

Which basketball player do you like best, Kobe, James or Jordan?—________ of them. Jeremy Lin is my favourtite.

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