Mrs. Smith showed the boys how to behave ________ like a gentleman at the dinner table.( )
A.happilyB.bravely
C.politelyD.differently
I _______ Anna since three years ago.( )
A.knewB.knowC.have known
If I go to the movie, I _______ my homework on time.( )
A.didn't finishB.don't finish
C.won't finish
I like Chinese, _______ I don't like math, because it's not easy to learn it well.( )
A.andB.butC.or
I think it's impolite _______ others waiting.( )
A.to keepB.keepingC.keep
I cleaned my room yesterday. It _______ a little difficult.( )
A.isB.wasC.will be