—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.
It is the hottest in __________ and August in Changchun.