The dictionay is really ____.
| A．much use | B．of useful | C．of much use | D．able to use |
I would have come sooner but I ________ that they were waiting.
| A．haven’t known | B．hadn’t known | C．don’t know | D．didn’t know |
—Did you find the missing couple in the mountain yesterday?
—No, but we ________ to get in touch with them ever since.
| A．have tried | B．have been trying | C．had tried | D．had been trying |
—Such a mistake could have been avoided.
—Unfortunately, he ________ the mistake again and again.
| A．repeated | B．would repeat | C．had repeated | D．would have repeated |
The student didn’t pay any attention to the lecture; he ________ of something else.
| A．thought | B．had thought | C．would think | D．was thinking |
At the time of the earthquake Jeff was still in his office. He ________ to finish a project before he left for the day.
| A．has tried | B．had tried | C．has been trying | D．had been trying |