1 . We had just begun to work________ the machine broke down.
| A．when | B．as | C．while | D．after |
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2 . ________ is the weather like?.
| A．When | B．What | C．How | D．Why |
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3 . I was on my way back to the hospital where the doctor was working________ Susan caught up with me.
| A．when | B．since | C．until | D．though |
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4 . I was about to watch a football match ________ my mother called me to buy drinks.
| A．while | B．as | C．when | D．until |
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5 . Dr. Wu promised that he wouldn’t stop doing operations ________ he was too weak to.
| A．if | B．unless | C．when | D．because |
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6 . I saw a man shouting at a driver yesterday ________ car was blocking the street.
| A．that | B．who | C．when | D．whose |
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7 . I failed the exam________ I did my best. But I’ll try harder next time.
| A．when | B．until | C．though | D．because |
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8 . He made a serious mistake. But he took action to change that ________ it got worse.
| A．until | B．unless | C．when | D．before |
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9 . Zhurong is the god of fire in ancient Chinese mythology,________echoes with the Chinese name of the red planet, Huoxing.
| A．which | B．that | C．when | D．where |
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10 . As we know, green employees cannot develop well ________they lack chances of practising.
| A．before | B．when | C．while | D．unless |
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