---We can't be successful _____ we keep on working hard. ---I agree with you.

---We can't be successful _____  we keep on working hard. ---I agree with you.

#57280

because

unless

until

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Jeff’s sister can’t swim _____dance.

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and

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They will lose the game    they try their best,

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— May I go to the concert with you?— I’m afraid not ______ you have a ticket, because I have only one.

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—Tom, you look tired this morning. What’s wrong?—I was so busy that I didn’t go to bed________12 o’clock last night.

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