--Who’s the man over there?Is it Mr Black?----It _____be him.He’s much taller.
— Why didn’t you go to the cinema with John last night? —_____I had lots of homework to finish.
—Do you know Robert? —Yes, He is__ university student. He likes sports and runs for ___ hour every morning. A a; a B a; an C an; an D an; a
They stayed in Beijing for a few days and visited some ________.
If you have headaches often, you need _______ .
He wasn’t _____ to understand the questions.