1 . Wear a life jacket ________ you fall into the water.
| A．in case | B．as if | C．even if | D．so that |
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2 . ________ he is a ten-year-old boy, he can take good care of himself.
| A．Although | B．Or | C．So | D．But |
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3 . My parents won’t let me go out alone ________ they are sure I’m safe.
| A．since | B．if | C．unless | D．because |
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4 . The great use of a school education is not so much to teach you things ________ to teach you the art of learning.
| A．than | B．rather than | C．nor | D．as |
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5 . The journey has been flying by, and ________ I know it, we have reached Tangula Station.
| A．before | B．after | C．when | D．since |
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6 . It is 10 years ________ these important environmental problems were addressed, which benefited the entire world.
| A．since | B．after | C．before | D．when |
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7 . We packed all the books in the boxes_____they wouldn’t get damaged.
| A．as if | B．so that | C．in case | D．even if |
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8 . I remember the whole thing clearly ________ it happened yesterday.
| A．as if | B．unless | C．as long as | D．even if |
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9 . It doesn’t matter ________ you go back to your hometown by train or by plane — both ways are convenient.
| A．whether | B．how | C．if | D．when |
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10 . There’s a rare illness that can cause blindness or serious loss of vision ______ left untreated.
| A．if | B．unless |
| C．though | D．in case |
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