I was born ______September 15th，1998．
A. at B.on C. in

----Nobody . She taught_________ ．
A. her B. hers C. herself

He had a bad cold , _______ he kept on working as usual．
A. her B. but C. though

As the saying goes，the moon________ always be full .
A. can’t B. shouldn't C. mustn’t

---- I've spent the whole afternoon reading books.
-- -I think you'd better go out and get some _______ air.
A bad B. thick C. fresh