You’d better book the tickets as early as possible, ________ they will be sold out soon. 
#56032
A
and
B
but
C
so
D
or
推荐题目
Don’t get off the bus _____ it has stopped.
#57377
A
after
B
when
C
if
D
until
I have to leave now __ I can catch the last bus.
#56432
A
so that
B
because of
C
until
D
as soon as