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30. Walking in the crowded street, the little girl got ______ from her mother, and started crying. 

A. separated             B. divided           C. lost             D. gone

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29. It ____ to me that the boy might be in danger, so I asked Bob to help me look for him.

  A. happened          B. occurred          C. rushed              D. struck

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28. It was _____ the old man was about to go to bed that someone knocked at the door.

  A. until              B. when            C. since           D. after

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27. ______ 3000 years, the Spring Festival celebrates the passing of a year and welcomes a new one.

  A. Date back to        B. To date back to      C. Dating back       D. Dated back to

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26. No matter what others say, I still think _____ quite possible that my dream will come true one day.

  A. that              B. this             C. it              D. X

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