Stephen Hawking believes that earth is unlikely to be the only planet ______ life has developed gradually.   

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• 1After visiting the harbor in the bay, they took a tour around the downtown area, ______ they visited many art galleries, shopping centers and had their lunch in a restaurant that served fancy foods.

  A.which

  B.as

  C.where

  D.what

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• 2The reason__________ I didn't come to the party was_________I didn't get the invitation.         

  A.why; because

  B.why; that

  C.for which; because

  D.in which ; that

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• 3The knee is the joint ______ the thigh bone meets the large bone of the lower leg.

  A.when

  B.where

  C.which

  D.that

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• 4He got himself into a difficult situation________he must make a final decision.

  A.which

  B.what

  C.when

  D.where

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• 5She'll never forget her stay there ________ she found her son who had gone missing two years before.

  A.that

  B.which

  C.where

  D.when

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