(2011·重庆)It is still under discussion ________ the old bus station should be replaced with a modern hotel or not.

We should learn how to well with people around us.

ear’s children’s party, ________ some parents were invited to, was a great success.

It’s clever _____you to help me work out the difficult math problem. Thanks!— You are welcome. Now it’s easier _______you to understand it.

Little John hardly got anything in________ for his kind act, ________ made him unhappy．