— I can’t get through to the general manager’s office.
—The line is busy. Someone ________ the telephone.
| A．must have used | B．could use | C．could have used | D．must be using |
Mom, you’ve bought the wrong shirt. It’s not the red one _____ the blue one.
| A．or | B．and | C．but | D．either |
--- Joe, would you like to play _____ volleyball with us this afternoon?
--- Sorry, I need to practice playing ______ piano.
| A．a; the | B．the; a | C．不填, a | D．不填, the |
People have learned a lot from _______ / saɪən'tɪfɪk / studies.
| A．science | B．scientific |
| C．sight | D．sightseeing |
All of the books are worth ________ /'riːdɪŋ/.
| A．read | B．red | C．reading | D．reads |
To be _______ /'ɒnɪst/, I don’t think we have a change of winning.
| A．ought | B．said | C．honest | D．object |