_______ Peter is old and weak, he still has to work.

_______ Peter is old and weak, he still has to work.

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But

Even though

Because of

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I didn’t know he came back __________ I met him in the street .

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since

when

until

after

They  are some pens,some books       some cards.

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and

but

 I am a student ________ I am Chinese.

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but

and

I like the shirt,        it’s too expensive.

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but

and

If you have trouble pronouncing the word, you can repeat it over and over again _______ you are comfortable with it.

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unless

until

while