We must keep the classroom clean for dirt and disease go ________．


  1. A.
    from time to time
  2. B.
    hand in hand
  3. C.
    one after another
  4. D.
    step by step

Can you ________ the differences between the twins?


  1. A.
    know
  2. B.
    say
  3. C.
    spot
  4. D.
    speak

It is believed that more than one person may ________ for the mine accident．


  1. A.
    be to blame
  2. B.
    blame
  3. C.
    punish
  4. D.
    be to punish

I’m afraid your mobile phone has to get ________ before it works normally again．


  1. A.
    changed
  2. B.
    charged
  3. C.
    cleaned
  4. D.
    electrified

The new law to punish the drunk driver will come into ________ on the day it passes．


  1. A.
    existence
  2. B.
    use
  3. C.
    service
  4. D.
    effect

Does anybody know how it ________ to live without eating for so many months?


  1. A.
    keeps
  2. B.
    manages
  3. C.
    succeeds
  4. D.
    tries

________ it carefully can we hope to find a way to solve the challenging problem．


  1. A.
    When we observe
  2. B.
    When to observe
  3. C.
    That we should only observe
  4. D.
    Only by observing

I thought I was going to fail the driving test but I succeeded ________．


  1. A.
    after all
  2. B.
    first of all
  3. C.
    in all
  4. D.
    at all

We were looking for you all this morning．You ________ office without a word．


  1. A.
    mustn’t leave
  2. B.
    shouldn’t have left
  3. C.
    couldn’t have left
  4. D.
    needn’t leave

The two collectors have determined to buy the precious Egyptian vase, ________．


  1. A.
    however much it costs
  2. B.
    no matter how it costs
  3. C.
    however much does it cost
  4. D.
    no matter how much does it cost
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