Behind the department store there used to ______ much waste, _______?
#68979
A
have; usedn’t it
B
being; usedn’t there
C
be; usedn’t it
D
be; usedn’t there
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It’s important ________ the piano well. 
#70667
A
of him to play
B
for him to play
C
of him playing
D
for him playing
— I often chat with my friends on the Internet.— You are so smart! Will you please tell me____?
#71052
A
how to do
B
how to do it
C
how to use
D
when can I use it
We don’t know ________ it next. Let’s go and ask Mr. Li.
#71165
A
what to do
B
to do what
C
whether to do
D
to do whether