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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Boys and girls, attention, please. Now let me tell you ____ to the Bird Island.
#60325
A
how to get
B
what to get
C
whom to get
D
where to get
—_______ do you like to fly, economy or first class?—Economy, I think.
#64638
A
What
B
Where
C
Which
D
How
Sally’s never seen a play in the Shanghai Grand Theatre, _______?
#65502
A
hasn’t she
B
has she
C
isn’t she
D
is she
Do you think ________important ________ fit?
#60354
A
that; keeping
B
this; to keep
C
it; keep
D
it; to keep