David didn’t give up ______ he had failed in the experiment four times.
#58224
A
if
B
while
C
though
D
since
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The robot did all the housework. _________, Mr. White no longer needed to get up early.
#57829
A
At first
B
At last
C
As a result
D
As usual
---_______does your mother watch the Talk show? ---Once a week.
#56342
A
How long
B
How often
C
How soon
D
How many
---What did you do last night? ---I didn’t play the piano, _______, I watched a film with my parents.
#57907
A
but
B
and
C
instead of
D
instead