_______is the population____the USA?
#60189
A
What, of
B
What, in
C
How many, in
D
How many , of
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As far as we know, half of Canadian teenagers do not get enough sleep on school nights, _____?
#64802
A
do they
B
don’t they
C
don’t you
D
isn’t it
I think he must be writing his essay at home now, ______?
#64717
A
is he
B
isn’t he
C
do I
D
mustn’t he
I told them not everybody could run as fast as you did，________？(2011·重庆)
#64497
A
could he
B
didn't I
C
didn't you
D
could they