27. The development of science and technology must benefit people _____ harm them.
| A．more than | B．rather than | C．other than | D．better than |
If something ________, it becomes less and less and eventually disappears completely.
| A．dies off | B．breaks off | C．dies out | D．breaks out |
It’s the first time ______ he has helped us.
| A．that | B．before | C．when | D．who |
Here are two pairs of shoes, ______ you may choose.
| A．both of them | B．either of them | C．any of which | D．either of which |
He plays well or badly according to his mood (心情), so he’s a very _________ player.
| A．modest | B．easygoing | C．temperamental | D．calm |
No one knows exactly ______ this important discovery was made.
| A．that | B．that how | C．what | D．when |