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Some scientists think there are _______ 2，000 million flashes of lightning per year.
#26291
A
in short
B
on average
C
as usual
D
in total
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Teenagers are often compared ___ the rising sun.
#28891
A
with
B
to
C
like
D
as
He convinced me __________the difficulty of the work.
#25739
A
on
B
at
C
for
D
of
    our daily expenses, we have to put quite a lot for our daughter’s further education.
#26766
A
In addition
B
As well as
C
Beside
D
in addition to
Fred entered without knocking and, very out of breath, sank _________ a chair.
#28609
A
on
B
off
C
into
D
to
---How do often you go to school?---On foot_______it rains.
#25948
A
except
B
except when
C
excetp that
D
besides