—We should adopt ________methods to deal with some incidents. You know，anything could occur in that situation.
—I got it. Thank you for reminding me.
| A．flexible | B．typical |
| C．positive | D．concrete |
By the time Jane gets home, her aunt ____ for London to attend a meeting.
| A．will leave | B．will have left |
| C．leaves | D．left |
His sister left home in 1998, and ______ since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
The water ____ cool when I jumped into the pool for morning exercise.
| A．felt | B．is felt |
| C．was felt | D．feels |
The water supply has been cut off temporarily because the workers ____ one of the main pipes.
| A．are repairing | B．have repaired |
| C．repaired | D．had repaired |
The students ____ busily when Miss Brown went to get a book she_____ in the office.
| A．had written, left | B．were writing, has left |
| C．were writing, had left | D．had written, had left |