Do you regret________ up your opinion that every child should take part in service learning?— No.On the contrary, I think it is very necessary. [ ]

We have sweaters ______ all colors _____ $ 5 each.

The WHO has given some advice on to prevent us being infected(感染)with H7N9.

It’s not ______ to ask her age when you meet a girl for the first time.

Mr Li, who is in charge __ our class, will have a talk __you