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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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________ he got up early, _______ he still missed the early bus.
#57394
A
Although, but
B
Because, so
C
Although, /
D
Because, /
We’ll climb the mountain _______ the weather is bad this weekend.
#55892
A
if
B
when
C
until
D
unless
_________is she?  She is my sister.
#56122
A
How
B
Where
C
Who
D
What
I think he's been drinking, _______ I'm not completely sure.
#56106
A
if
B
though
C
because
D
while
You can’t watch TV         you finish your homework.
#58290
A
before
B
if
C
while
D
as