—Could I smoke here?—I’d prefer _______if you don’t smoke in front of the children.

The ladies would appreciate ______ if you could do them the favor to solve the two problems.

I need some carbon paper badly, but there is _____ at hand.

---Have you got used to the Chinese food, Robert?----Yes, but I don’t like ______ when a Chinese host keeps serving me the food I don’t like.  

Tom,Bob and Betty have arrived, but ___ students haven’t yet.