- What's wrong with you, Madam? - I've lost my valuable painting. But a week had gone by ______

 - What's wrong with you, Madam? - I've lost my valuable painting. But a week had gone by _______ I knew it was missing.

#55958

while

since

until

before

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 I am a student ________ I am Chinese.

#56119

but

and

 I always sleep with windows open _______ it is too cold outside.

#55291

until

that

unless

Don’t talk _____ drink in class.

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and

but

When you are learning English, use it, ________ you won’t make great progress.

#57425

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and

Never stand up ________ you are asked to.

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when

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