1 . David is very noisy ______ Katy is rather quiet.
| A．while | B．since | C．so | D．or |
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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 . 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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4 . 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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5 . 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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6 . 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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7 . parents want to stay involved and informed about their grown-up children, they must establish boundaries and help them to be independent.
| A．Because | B．Unless | C．While | D．Once |
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8 . ________her illness leaving her very weak at times, she tries to gain pleasure from life
| A．Despite | B．However | C．Although | D．Instead of |
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9 . you judge someone’s actions, try to understand their circumstances, as context often shapes decisions.
| A．Unless | B．Although | C．Before | D．Until |
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