___________there are many different types of food, some animals spend their lives eating only one type.
#31689
A
Since
B
Unless
C
Once
D
While
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How can you expect him to make any improvement ________ you never give him an opportunity to have a try?
#31115
A
unless
B
when
C
until
D
while
I won't give you such help_____ you beg me. It's beyond my ability.
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A
until
B
unless
C
as if
D
even if
It’s important to give the babysitter an emergency phone number ___ the children get hurt or sick.
#33416
A
in case
B
unless
C
even if
D
so long as
—Where are you going to spend your summer holiday? —I’ll go _____ it is already cool.
#33902
A
what
B
that
C
whether
D
where