There was a _____ look on his face. He found what the expert said too difficult to understand.
| A．puzzle | B．puzzling | C．puzzled | D．to puzzle |
While watching television, ________.
| A．the doorbell rang | B．the doorbell was rung |
| C．we heard the doorbell ring | D．we heard the doorbell rings |
In our factory there are 2,000 workers, two thirds of _______ are women.
| A．them | B．which | C．whom | D．who |
Your decision will affect your future study in college and your future job _______.
| A．as though | B．as if | C．as well | D．as well as |
Mr. Smith likes traveling _______; but his wife enjoys _______.
| A．by train; taking a taxi | B．on train; by taxi |
| C．by train; by taxi | D．on train; taking a taxi |
---Would you mind if I _______ here?
--- _______ . It’s not allowed.
| A．smoke; Yes, please | B．smoked; You’d better not |
| C．smoke; That’s all right | D．smoked; You are welcome |