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___________ is known to everybody, the noon travels around the earth once every month.
#71749
A
It
B
As
C
That
D
What
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Electronic devices such as iPods and headphones can do great harm to our hearing if _______ improperly.
#67875
A
being used
B
used
C
to be used
D
having been used
Hot _______ the night air was, we slept deeply because we were so tired after the long journey. 
#67722
A
although
B
however
C
while
D
as
   ______they have been working hard to find?
#70400
A
Is that what
B
Is that
C
It is that
D
Is it that
The boy said sadly，“No one can tell ______ will happen next.”
#72258
A
what
B
when
C
who
D
where
 I met several people there, two of _____were foreigners. 
#72314
A
whom　
B
them　
C
who　
D
which