— Can I use your notebook computer this afternoon? ________ is under repair.— No problem. 

---Oh, it tastes quite good. May I have _________ cup of coffee? ---OK. Here you are. 

Mum couldn’t find any help and had to do the housework_________.

–Who’s your science teacher this term?–Mr. Wang. _______ is a good teacher.

 _________of the two boys is from America. They’re from Canada.