I hate travelling by air__________ you usually have to wait for hours before the plane takes off.
#56398
A
because
B
though
C
until
D
unless
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--Lucy is doing her homework. ---Let’s ask Lily _______.
#58314
A
but
B
except
C
instead
D
instead of
Don’t stop working _____ twelve. 
#58157
A
to
B
at
C
when
D
until
______ he is very busy, Li Ming always helps others.
#56088
A
Although
B
If
C
Unless
D
Since