The Yellow River is _________river in China.
| A．the longest | B．the longer |
| C．the second longer | D．the second longest |
--- Lin Tao, can I use your English dictionary?
--- Sure. But you _______ return it before the class.
| A．must | B．can | C．may | D．would |
You_______ play with the knife. You ______ hurt yourself.
| A．mustn’t; may | B．mustn’t; mus |
| C．shouldn’t; must | D．can’t; should |
— It seems that Mr. Wu is standing there.
— It ______ be him because he called me from Canada just now.
| A．mustn’t | B．can’t |
| C．needn’t | D．shouldn’t |
—Will you please answer the door? It ________ be your sister.
—Sorry, I ________. I’m feeding the rabbit.
| A．must; mustn’t | B．may; can’t |
| C．will; can’t | D．must; needn’t |
--- Listen! David is talking happily with his mother in the next room.
--- It ______ be his mother. She has gone to Yunnan to be a volunteer doctor.
| A．should | B．must |
| C．can’t | D．mustn’t |