第1题：
When he arrived in New York, it was snowing.
第2题：
A.arrives
B.arrive
C.will arrive
D.arrived
第3题：
The teachers??____________ the office for a few minutes when we arrived. We didn’t meet them.
A. had been away from B. had left
C. have been away from D. have left
第4题：
_____ tomorrow, we should be glad.
A、Were they to arrive
B、They were to arrive
C、They would arrive
D、They arrive
第5题：
If we ___ the other road ,we might have arrived here in time for the meeting. ( )
A.take
B.had taken
C.took
D. have taken
第6题：
A.cooking … eating
B.a cooking … an eating
C.the cooking … the eating
D.cook…eat
第7题：
The human nose is an underrated tool. Humans are often thought to be insensitive smellers compared with animals, __1__ this is largely because, __2__ animals, we stand upright. This means that our noses are __3__ to perceiving those smells which float through the air, __4__ the majority of smells which stick to surfaces. In fact, __5__, we are extremely sensitive to smells, __6__ we do not generally realize it. Our noses are capable of __7__ human smells even when these are __8__ to far below one part in one million.
Strangely, some people find that they can smell one type of flower but not another, __9__ others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate __10__ smell receptors in the nose. These receptors are the cells which sense smells and send __11__ to the brain. However, it has been found that even people insensitive to a certain smell __12__ can suddenly become sensitive to it when __13__ to it often enough.
The explanation for insensitivity to smell seems to be that brain finds it __14__ to keep all smell receptors working all the time but can __15__ new receptors if necessary. This may __16__ explain why we are not usually sensitive to our own smells we simply do not need to be. We are not __17__ of the usual smell of our own house but we __18__ new smells when we visit someone else’s. The brain finds it best to keep smell receptors __19__ for unfamiliar and emergency signals __20__ the smell of smoke, which might indicate the danger of fire.
1________________
[A] although
[B] as
[C] but
[D] while
第8题：
A、to
B、on
C、at
D、in
第9题：
We have to wait for a while because Mum _____cooking yet.
A. has finished
B. didn't finish
C. hasn't finished
第10题：
A、to lie
B、lay
C、lying