--Has the meeting begun yet？
--Not yet． We have to wait everyone is here．
A. and B. until C. or D. but
—Cindy, which backpack do you like best?
—Let me see. blue one.
A.A B.An C.The D./
My sister is very warm—hearted. She always gets on well __________ both the old and the young.
—Peter, could you please ________ your dictionary to me? Mine is at home.
—Sure. Here you are.
This math problem is so __________ that all the students can work it out.
—Tom. don't forget to turn __________ all the lights before you leave.
—OK, I will.
