This type of bamboo grows very fast and it will take only three to five years _____ it can be used in various fields .
| A．before | B．since | C．when | D．as |
People hope to become more _____ in predicting earthquakes.
| A．absolute | B．steady | C．perfect | D．accurate |
We had a really bad time about six months ago but now things are _____.
| A．picking up | B．coming up | C．making up | D．turning up |
— What's the matter with you, Lucy?
— After the long walk, my legs _____ and I couldn't go any farther.
| A．gave off | B．gave in | C．gave up | D．gave out |
The task _____ more difficult than we expect.
| A．proved to | B．proved us | C．was proved | D．proved |
_____ his happy look, he must have passed the driving test.
| A．To judge by | B．Being judged from | C．Judging by | D．Judge from |