My parents were quarrelling about me ____ I could not quite tell why．
#79999
A
since
B
though
C
if
D
until
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children believe they can succeed, they will never become totally independent．
#32545
A
If
B
Though
C
Unless
D
When
The tour was fantastic in general, our car broke down on the way back.
#31804
A
as
B
though
C
whether
D
since
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
---Mum, can I go out to play football with Alice? ---No, you can’t your homework is done.
#33770
A
while
B
after
C
until
D
as