— How long will it be _______ the president pays another visit to China?

— How long will it be _______ the president pays another visit to China?— It all depends.

#32222

before

until

since

when

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— Did he realize the serious situation immediately?— No. It was quite a long time ________ he really realized it.

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now that

when

ever since

before

The shop doesn’t open until 11 am, _______ it loses a lot of business.

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for

but

They were surprised that a child should work out the problem ________ they themselves couldn't.

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once

then

While

I have many friends, _____ some are businessman.

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of them

from which

who of

of whom

---Did you wait for him long? ---No, I hadn’t waited long _______ he appeared.

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unless

until

before

since

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