—Did you return Fred's call?
—I didn't need to ________ I'll see him tomorrow.
| A．though | B．unless | C．when | D．because |
_____he said in the lecture has a great effect on me.
| A．What | B．Which | C．That | D．How |
The teacher warned her students ______late for the sports meet next Monday.
| A．not to be | B．to be not |
| C．not being | D．not be |
The soil is becoming poor because farmers here mostly use only one kind of chemical fertilizer for several years________.
| A．in a row | B．on a large scale |
| C．at random | D．to a degree |
With the city ________ clouded by dirty smog, the government has planned to shut down the four major coal-fired power plants.
| A．abruptly | B．frequently |
| C．occasionally | D．regularly |
The IOC Evaluation Commission has come to a ________ conclusion that Beijing is capable of hosting a successful 2022 winter Olympics.
| A．tentative | B．virtual |
| C．definite | D．subtle |