A good teacher must be able to hold his students’ attention ____ he reaches the end of the class.
#31352
A
when
B
after
C
until
D
unless
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We agree to reduce our price by 3% ____ you guarantee to open the credit card on time.
#31456
A
unless
B
so that
C
even if
D
on condition that
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
_____ the police thought he was the most likely one, they could not arrest him since they had no exact proof about it.
#30986
A
Although
B
As long as
C
If only
D
As soon as
In some countries such as France or Italy, it’s common to exchange a kiss when shaking hands, ______ in China, it’s not acceptable.
#30709
A
while
B
when
C
if
D
because
I should have bought the beautiful vase, but I ____________enough money.
#32878
A
didn’t have
B
don’t have
C
haven’t had
D
hadn’t had