David didn’t give up ______ he had failed in the experiment four times．

David didn’t give up ______ he had failed in the experiment four times．

#57729

while

though

since

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Last Sunday, we visited the factory _____ my father ever worked for four years.

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where

which

what

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_______________many children like sugar, I think they had better try not to eat it too often.

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since

as soon as

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but