_____ a lot of small ads are put up on the walls, out city will be untidy.
#55173
A
Until
B
Though
C
If
D
Unless
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Elsa hates going shopping, she went last night when her grandpa asked her to buy some medicine for him.
#58546
A
because
B
but
C
if
D
so
A tourist will easily lose his way in Shanghai_____ he has a map or a guide.
#56219
A
if
B
since
C
while
D
unless
________ the alien was in the museum, I called the TV station.
#57443
A
Because
B
Then
C
As soon as
D
While