He ___ to break the record for the long-distance race.
| A．set out | B．set off | C．set up | D．set down |
Copernicus’s theory is now the basis ______ all our ideas of the universe are built.
| A．to which | B．on which | C．for which | D．by which |
With a MBA degree from Harvard University, our boss takes a______ method to manage the company, which benefits everyone a lot.
| A．consistent | B．violent | C．scientific | D．Rough |
_______to sunlight for too much time will do harm to one’s skin.
| A．Exposing | B．Being exposed | C．Having exposed | D．Exposed |
— Can you lend me the book Gone with the Wind?
— Sorry. I returned it to the library just now. Maybe it is still ____.
| A．available | B．affordable | C．acceptable | D．valuable |
You are working too hard. You'd better keep a ________ between work and relaxation.
| A．promise | B．read | C．balance | D．diary |