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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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---_____is his mother? ----She is a lawyer.
#65314
A
How
B
What
C
Where
D
How old
--- What’s this ?   ---         .
#60138
A
This is a ruler.
B
r-u-l-e-r
C
Its a ruler
D
It’s a ruler.
—______ your brother ______ a basketball? —Yes, he does.
#59787
A
Is; have
B
Do; have
C
Does; has
D
Does; have
________ does it take you _______ to work from your home every day?
#59915
A
How long; ride
B
How long; to ride
C
When; ride
D
When; to ride
---_____ does she chat with friends on the Internet?--- Once a week.
#59954
A
How long
B
How often
C
How many times
D
How much