—Do you want tea or coffee?—________.I really don’t mind.

 --- How many of you have solved the math problem?--- ________, the math problem is far too difficult for us to work out. .

 I'm moving to the countryside because the air there is much fresher than _______ in the city.

一I bought this coat at taobao．com—It looks beautiful．As I am busy，can you buy        for me?

--- I didn’t bring back anything from America. ---  _________ at all?  Why not?