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Fighting an artificial greenhouse effect seems to be the greatest of environmental challenges, ________？
#64479
A
isn't it
B
does it
C
doesn't it
D
is it
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I suppose you are unwilling to change your idea, _____?
#64681
A
aren’t you
B
do I
C
don’t I
D
are you
You won’t surf the internet before you finish your homework, ______ you?
#64886
A
do
B
don’t
C
will
D
won’t
—____ does Jane exercise?—Four times a week.
#60119
A
How soon
B
What time
C
How long
D
How often
He must have known the truth yesterday, _________?
#64623
A
haven’t you
B
didn’t you
C
have you
D
did you
       do you go to school, on foot or by bus?
#59983
A
When
B
Why
C
How
D
What