In a chemical change, energy cannot be created ,_______.

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• 1Many scientists believe that global warming , if ______ , will cause extreme climate changes this century .

  A.not stopping

  B.no stop

  C.not stopped

  D.without stop

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• 2_______, I'd have told you.

  A.If I would have known

  B.If I had have known

  C.Had I known

  D.Should I know

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• 3________ a beautiful palace ________ the foot of the hill.

  A.There stand; at

  B.There stands; under

  C.Stands there; under　

  D.There stands; at

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• 4______earlier, I' d have told you.

  A.If I would have known it

  B.Had I known it

  C.If I knew it.

  D.Should I know it

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• 5So loudly _____ that ____ hear her clearly.

  A.did she speak; could everyone　

  B.did she speak; everyone could

  C.she spoke; could everyone　

  D.she spoke; everyone could

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• 6Only when the meeting was over ______ go back to meet his friend.

  A.he could　

  B.he was able to　

  C.was he able to

  D.was able to he

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• 7Never_______Lisa would arrive but she turned up at the last minute.

  A.did we think

  B.have we thought

  C.we thought

  D.we have thought

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• 8Only in recent years ______ to realize the importance of wildlife conservation.

  A.do people begin

  B.have people begun

  C.people have begun

  D.people begin

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• 9Not only_______know the theory, but also_______learn how to apply it in practice.

  A.should we; should we

  B.we should; we should

  C.should we; we should

  D.we should; should we

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• 10He spoke ______ quickly ______ I couldn't understand a word he was saying.

  A.such; that

  B.so; that

  C.too; to

  D.quite; that

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