—Must we clean the classroom now?—No ,you _______.

—We want someone to design the new art museum for us?—          the young fellow have a try?

 –Look! A man is cutting a tree on the moon. --It ______ be true. The teacher said there is no air on the moon.

--- The drought situation has been severe these days．--- If it had rained even a drop, things would be much better now and many crops ____．

—Look! Is that Mr. Green?—It          be Mr. Green. He has gone to Shanghai.