_For six or seven months in the year,no work can be done, ______

_For six or seven months in the year,no work can be done, _______the rainy season makes it impossible.

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until

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The field research will take Joan and Paul about five months; it will be a long time ____ we meet them again.

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after

before

since

when

 Don’t be afraid of asking for help _______ it is needed.

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though

although

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.I don’t like the way ______ he talks; he is so rude.

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which

where

in that

_A container weighs more after air is put in, ____proves that air has weight.

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 Energy, passion and a burning desire are, you see, ________ true learning takes.

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what

how

which