He will spend six hours at his desk _______ he finishes his composition.
#79623
A
before
B
until
C
after
D
when
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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
In time of serious accidents, ________ we know some basic things about first aid, we can save lives.
#30162
A
whether
B
until
C
if
D
unless
The open-air celebration has been put off _______ the bad weather.
#79966
A
in case of
B
in spite of
C
instead of
D
because of
Mary felt sad over the loss of photos she had shot in Australia, ______ that was a memory she especially treasured.
#31852
A
as
B
which
C
when
D
where
__ unemployment and crime are high, it can be assumed that the latter is due to the former.
#80573
A
Before
B
Where
C
Unless
D
Until