— Susan, would you like to go hiking with us this afternoon?— I'd love to, but I study for a test.A. may B. have to C. can
________trees we plant,________our city will be.
—Which coat is________,the black one or the gray one?—The black one,of course.
In spring,the day is getting________.
We should do some things to protect the environment.For example,we shouldn’t________too many trees.
—Remember this,children.________careful you are,________mistakes you will make.—We know.Mr.Li.