_______ there are many different types of food, some animals spend their lives eating only one type.
#30197
A
Since
B
Unless
C
Once
D
While
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A
when
B
after
C
until
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Just use this room for the time being, and we'll offer you a larger one ________ it becomes available.(2010·安徽)
#29961
A
as soon as
B
unless
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How can they expect to learn anything ________ they never listen?
#30286
A
whether
B
when
C
but
D
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Leave your key with your neighbor _you lock yourself out one day.
#31885
A
as long as
B
in case
C
even though
D
as if