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  1. #1
    sumaiyyatahseen is offline Newbie
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    Default Choose the best answer

    Some scientists_________________us that the thermal blanket around the globe_____________________. the average temperature of the earth to rise.
    were warning / has caused
    had warned / caused
    have warned / may cause
    have been warning / was causing
    If transport costs_____________ into consideration at the outset, the plant____________. far from its present site.
    will be taken / are being built.
    had been taken / would have been built
    have been taken / have been built
    were being taken / will be built
    The first laser ______________. in 1960 by Maiman, almost half a century after the publication in 1916 of Einstein`s theory of radiation which ________________. the possibility of laser operation.
    has been demonstrated / had shown
    had been demonstrated / showed
    was demonstrated / showed
    demonstrates / was shown

  2. #2
    Rover_KE is offline Moderator
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      • Retired English Teacher
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    Default Re: Choose the best answer

    Don't ask us to do your homework.

    Rover

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