Last Friday I saw some boys ______ behind Daniel, _____ the computer games.

How I _____ I could live on the moon.

It’s necessary ______ us to keep our pets clean everyday.

---Would you like to go out for a walk with us?

---_____, but I must finish my homework first.

Is Tom at school today?No, He ’s at home ______ he has a bad cold.

______ hard work it is!

Mrs. White has _____ that she is not able to get a job.

People in some areas don’t have to pay for their ______.

Dr. Yang worked ______ three days ago.

Mr. Green is used to_________ two apples after lunch every day.