It was quite right for Yuan Longping to think that________was to have more rice and produce it more quickly.
| A．the key to feeding people |
| B．the key to feed people |
| C．the key of feeding people |
| D．the key of feed people |
There is not much time left; So I'll tell you about it _____.
| A．in detail | B．in brief | C．in short | D．in all |
The driver can adjust the heating in winter and the air conditioning in summer to suit his own _____.
| A．leisure | B．preference | C．convenience | D．selection |
She felt _____ of having asked such a silly question when the audience couldn't help laughing.
| A．guilty | B．crazy | C．miserable | D．ashamed |
After a short holiday, he _____ himself once more to his studies.
| A．applied | B．converted | C．engaged | D．exerted |
Although he hasn't any formal qualifications, Betas _____ to do well for himself.
| A．managed | B．succeeded | C．arranged | D．convinced |