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19. There are five _____________ (thousand) workers at that

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19. There are five _____________ (thousand) workers at that factory
20. Three fifths population of this city _____________ (be) from other cities.
21. I _______________ (study) English at this school for three years.
22. Do you have any problem ______________ (get) to the top of the hill
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19. There are five _____________ (thousand) workers at that
19thousand几千没有复数20 is population是不可数名词21 have studied现在完成时 22getting have problem doing sth不明白再问