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.

#58224

while

though

since

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You may watch TV this evening, _____ you must finish your homework first.

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and

but

 You’ll fail the exam _____ you work hard.

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unless

—Tom isn’t feeling very well.  —He seems to have a cold      the weather changes suddenly.

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before

because

Kelly Clarkson is so popular among young people _____ her beautiful voice.

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because

because of

instead

instead of

You’d better look up the new word in a dictionary _____ you don’t know it ?

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that

though

whether

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