_________ my grandfather grew older, he lost interest in everything except fishing.
#31540
A
While
B
When
C
As
D
Since
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Europe has achieved more in controlling the AIDS virus than Asia in the past ten years, ______ the number of people infected with the virus is going up sharply.
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A
when
B
which
C
that
D
where
Is__________ with these troubles in mind__________ the Royal Society called for the world’s governments to investigate geo-engineering as a “Plan B”?
#34071
A
it,that
B
that,it
C
that,what
D
what,that
I have a tight budget for the trip, so I'm not going to fly _ the airlines lower ticket prices.
#31637
A
once
B
if
C
after
D
unless
Yellow Mountain is such an attractive place of interest everyone likes to visit.
#33251
A
as
B
that
C
which
D
what