Smile to the world, ________ the world will smile back to you.

Smile to the world, ________ the world will smile back to you.

#56394

nor

but

and

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We never know we will succeed ________ we actually try.

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until

when

unless

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You will fall behind others _______ you work hard.

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Some people waste a lot of food___________ others don’t have enough to eat.

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You’ll be late __________ you don’t get up now.

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The patients will have to wait all day ______ the doctor works faster.

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