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The patients will have to wait all day ______ the doctor works faster.
#56848
A
if
B
unless
C
whether
D
that
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Plane will be very large _______ flying will be very cheap.
#57924
A
and
B
so
C
but
D
or
People cut down too many trees, _____ the greenhouse effect becomes more and more serious.
#56516
A
so
B
because
C
although
D
if
I won’t pass the exam ______I work hard.
#58063
A
whenever
B
because
C
if
D
unless
The visitors         our factory two days ago.
#56089
A
got
B
reached in　　
C
arrived 　　
D
reached
Mr. Zhou was really anxious _____he can’t find his car.
#55718
A
while
B
because
C
though
D
until