—People often don't appreciate what they have, do they? —No, _________ they lose it.
#30726
A
if
B
after
C
until
D
when
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--Are you going somewhere during the winter vacation? --Yes, I’ve found a nice beach ________ I can enjoy swimming even in February．
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A
that
B
when
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where
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which
_________you’ve known the importance of it, you should try your best to do it.
#33114
A
So that
B
Now that
C
Now then
D
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Your work would be much better _____ you’re always in such a hurry.
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A
when
B
because
C
once
D
unless
You shouldn’t accept a gift from a person _____ you don’t know him.
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A
until
B
unless
C
if
D
whether