| 1. 单选题 | 详细信息 |
|
______ scientists have learned a lot about the universe, there is much we still don't know.
A . Once
B . Since
C . Though
D . Unless
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| 2. 单选题 | 详细信息 |
|
You won’t find paper cutting difficult _____you keep practicing it.
A . even if
B . as long as
C . as if
D . ever since
|
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| 3. 单选题 | 详细信息 |
|
____ the damage is done, it will take many years for the farmland to recover.
A . Until
B . Unless
C . Once
D . Although
|
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| 4. 单选题 | 详细信息 |
|
It is so cold that you can't go outside _____ fully covered in thick clothes.
A . if
B . unless
C . once
D . when
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| 5. 单选题 | 详细信息 |
|
_____ the students came from different countries, they got along quite well in the summer camp.
A . While
B . Unless
C . Since
D . Until
|
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| 6. 单选题 | 详细信息 |
|
My grandfather still plays tennis now and then, he's in his nineties.
A . as long as
B . as if
C . even though
D . in case
|
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| 7. 单选题 | 详细信息 |
|
I really enjoy listening to music ___ it helps me relax and takes my mind away from other cares of the day.
A . because
B . before
C . unless
D . until
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| 8. 单选题 | 详细信息 |
|
I am not afraid of tomorrow, ______ I have seen yesterday and I love today.
A . so
B . and
C . for
D . but
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| 9. 单选题 | 详细信息 |
|
_______online shopping has changed our life, not all of its effects have been positive.
A . Since
B . After
C . While
D . Unless
|
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| 10. 单选题 | 详细信息 |
|
______ the average age of the population increases, there are more and more old people to care for.
A . Unless
B . Until
C . As
D . While
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