.________they were singing, the teacher came in.
#72179
A
Before
B
after
C
As
D
Until
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Hot _______ the night air was, we slept deeply because we were so tired after the long journey.
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A
although
B
however
C
while
D
as
__________ is often the case with her, my mother talked about my study for at least half an hour nonstop before she drove me to school yesterday．
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A
As
B
Which
C
What
D
That
______we were worried about was ________they could manage to control the pollution.
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A
That how
B
That whether
C
What that
D
What whether
This photo of mine was taken__________ stood the famous high tower.
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A
which
B
in which
C
where
D
there