--- Why are you so happy?--- That’s because an old friend of            is coming.

I think _______ is meaningful to help other people.

---When shall we meet again next week?--- ____ day is possible. It’s no problem with me.

--- What’s wrong with my son, doctor? --- ____________ serious, just a slight cold. He’d better drink some water.

-There is still a copy of this book in the library. Will you go and borrow _________? --No, I will buy         in the bookstore.