A good teacher must be able to help his students learn the subject with great interest ______ he reaches the last minute of the class.
| A．when | B．unless | C．until | D．after |
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16. The river, ______the bank are covered with trees, is very long.
| A．whose | B．which | C．of which | D．which of |
While building a tunnel through the mountain, ________ .
| A．an underground lake was discovered |
| B．there was an underground lake discovered |
| C．a lake was discovered underground |
| D．the workers discovered an underground lake |
Lei Feng is always ready to help others when they are in trouble and he never ______ their request.
| A．turns up | B．turns over | C．turns in | D．turns down |
The film “A World without Thieves” a great success and brought in a large profit to the cinema .
| A．appreciated | B．enjoyed | C．won | D．seized |
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