Most birds find it safe to sleep in the trees, but _______ they have eggs or young chicks, they don't use a nest.

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• 1Having checked the doors were closed, and ______ all the lights were off, the boy openedthe door to his bedroom.   

  A.that

  B.why

  C.when

  D.where

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• 2Though invited several   times, I still have some doubt _______ I can go to his   birthday party.     

  A.when

  B.where

  C.why

  D.whether

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• 3— You look unhappy, my son?— I'm wondering how long it'll be _______ we come to China again.

  A.since

  B.when

  C.before

  D.after

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• 4Tom kept quiet about the accident ________ lose his job.   

  A.so not as to

  B.so as not to

  C.so as to not

  D.not so as to

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• 5The first time for everything is always the most exciting one. _____ it is your first day in a new job or going on a first date, you will always remember those 'first' times.   

  A.No matter

  B.Whether

  C.Either

  D.Both

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• 6It is obvious to the students ______ they should get well prepared for their future.     

  A.as

  B.which

  C.whether

  D.that

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• 7I'd like to study law at university _______ my cousin prefers geography.

  A.though

  B.while

  C.as

  D.for

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• 8____ many countries in Latin America have been trying to reduce  gaps in income, America has allowed inequality to grow.    

  A.While

  B.Since

  C.If

  D.So

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• 9_____   you  have  finished  your homework, you can play basketball.       

  A.Now that

  B.Because

  C.For

  D.As

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• 10____ you take a photo, you should always check the position of the sun.

  A.Before

  B.After

  C.Because

  D.Though

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