—Is Mr.Smith over there?—It ________ be him. He has gone to Beijing on business.
About 75% percent of the students can go swimming ____the rest can't.
I don't like the big computer. It __too much money and __up a lot of space
You'd better ride a bike to go to school _____ taking a bus every day.
--Remember this, boys and girls. _____careful you are, _____mistakes you will make. ---We know, Miss Wang.
_____trees are planted in our city every year.