Mr. Smith sold that magnificent cottage of his on the sea ____2,000,000 dollars.
| A．at | B．for | C．to | D．by |
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 |
The family is a cooperative enterprise for which it is difficult to _____ rules, because each family needs to work out its own ways to deal with its own problems.
| A．set up | B．put down | C．keep up | D．lay down |
| A．managed | B．succeeded | C．arranged | D．convinced |