Could you tell me when your father___back?—I’m not sure now. but when he ___next week, I’ll tell you.

Why not the music club? —– I’m sorry I can’t sing or dance.

A lot of trees________ around here every year, and we can enjoy fresher air now.

You are late for class, boy． –Sorry． Inext time．

Now China is fighting against illegal cooking oil（地沟油）, a kind of waste oil _____can cause a lot of illness.