A tourist will easily lose his way in Shanghai____

A tourist will easily lose his way in Shanghai_____ he has a map or a guide.

#56219

since

while

unless

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

#55173

Until

Though

Unless

 Yesterday morning I was just leaving_______ the telephone rang.

#55954

when

while

because

since

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

#56801

while

when

until

as soon as

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

#55354

that

but

because

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

#58050

and

but

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