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We should protect the earth，         we will have no water to drink．
#58271
A
so
B
or
C
and
D
but
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There are no buses, ________ you’ll have to walk.
#55404
A
so
B
or
C
but
D
for
—The classroom is ____ clean ____ it was yesterday.— Sorry, I forget to clean it.
#56798
A
as; as
B
so; as
C
not so; as
D
more; than
Why ____________ enjoy Beijing opera with us?
#57628
A
not to
B
don’t
C
not
D
you don’t
It’s dangerous______a tree．
#58020
A
climbing，
B
going up
C
to climb
D
clim
—Would you like to go for a walk with me, Allen?—I'd love to, ________you don't want to go alone.
#58269
A
until
B
before
C
if
D
after