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If too many species ___________ out, it will upset the ecosystem

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  However hard I tried, I could not keep ____ with the other students in class

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  Make sure that the needles are sterile

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  When did the short skirt first ....... ?

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• Choose the best answer:
  Introducing a new species to the area may be injurious to the local eco-system

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  If it _____________ convenient, let‟s go out for a drink tonight

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  OK, I'll ...... again later

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  I met an old friend from high school by chance at the airport

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  The school nurse looked me __________ and said I was fine to go back to class

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  Many working women rely on relatives to help take care of their children.

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  Taking care of the needs of the old, the sick and the homeless is our ____

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  Telecom giant Viettel decided to implement the 5G network _____ his technology was still uncommon

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  They should finish the tasks ______ without depending anyone

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  Don't ___________me as if I were an idiot!

• "How are you?" - "I'm .... "

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  Would you like to ....... with us some time?

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  What a pity! Thomas wasn't strong enough to ____ his own confidence

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   ____ in further education was seen as an insurance against poverty.

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  This year, so far, we ____ £ 16,000 and are still counting

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  They are a real ________ organisation; they are only interested in making a profit

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  Many wild animals are _______ threat ________ extinction