当你在早晨上学路上遇到同学的时候,你可以说 A.Good morning! B. Thanks ! C. Good evening!
Mr. and Mrs. Green work in the hospital, but they have no children. So they belong to _____.
_____ is a program to help children’s education in poor areas.
About _____ of the world population is Chinese.
We should plant more trees on sides of the street.
your help, we can finish the task in time.