---Where is the scientist ________ gave us the talk yesterday?
---He has gone back to Qinghua University.
| A．whom | B．who | C．whose | D．which |
There must be a boy ________ basketball outside the door. I hear him crying.
| A．play | B．plays | C．to play | D．playing |
Have you done ____ to improve the environment ?
| A．something useful | B．anything useful |
| C．nothing useful | D．useful anything |
—Who helped Betty tidy up the bedroom just now?
—________. She cleaned it all by herself.
| A．Somebody | B．Nobody | C．Everybody | D．Anybody |
The workers in the Huashan Mountains have to ______rubbish to keep the mountains clean.
| A．turn up | B．pick up | C．mix up | D．give up |
— Whose shoes are these?
— They ____ be Mike’s. They are much too large for him.
| A．might | B．may | C．mustn’t | D．can’t |