Which do you prefer to use to keep in touch with your friends，QQ_________

Which do you prefer to use to keep in touch with your friends，QQ__________MSN?

#56400

and

but

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_____ a lot of small ads are put up on the walls, out city will be untidy.

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Until

Though

Unless

 Yesterday morning I was just leaving_______ the telephone rang.

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when

while

because

since

I was just falling asleep ____ there was a loud knock at the door.

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while

when

until

as soon as

It was snowing hard_______we had to stay at home and watch TV.

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that

but

because

Finally, tired          happy, we took the subway back home.

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and

but

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