Schools in the south tend to be better equipped，_______those in the north are relatively poor.
#80045
A
while
B
since
C
when
D
as
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--- Daddy, I don’t want to go to Jimmy’s birthday. --- You had better go. ____ you make a promise, you have to keep it.
#30944
A
Once
B
Even if
C
Unless
D
In case
----Dad, can I go out to play basketball now ? ----- Sorry, you can’t ______you haven’t finished your homework.
#30714
A
before
B
until
C
as
D
unless
The researchers found clear and convincing evidence _________ happiness is the key when it comes to better health and longer lives.
#30504
A
where
B
whether
C
how
D
that