--- I wonder how much you charge for your service. --- The first two are free ______ the third costs $30.
#32246
A
while
B
until
C
when
D
before
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—Have you finished the book?—No，I’ve read up to____ the children discover the secret cave.
#30631
A
which
B
what
C
that
D
where
___ most of the earth’s surface is covered by water, fresh water is very rare and precious.
#80429
A
As
B
Once
C
If
D
Although
．A person ______ e-mail account is full won’t be able to send or receive any e-mails.
#34788
A
who
B
whom
C
whose
D
whoever