Desertification，the name for ______ happens when farmable land is turned into desert，is a growing world problem.
#72906
A
which
B
where
C
what
D
How
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The book was written in 1946, the education system has witnessed great charges.
#71797
A
when
B
during which
C
since then
D
since when
The reason _____ the president of Czech is widely discussed recently is _______ he was seen “to steal” a pen at a press conference in Chile.
#69094
A
why, because
B
that, that
C
why, that
D
why, why
The time is not far away______modern communications will become widespread in China’s vast countryside.
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A
as
B
until
C
before
D
when
(2014·天水一中高三检测)After many years of hard work，the man has finally reached the stage________he has gained good fortune and social status.
#66726
A
where
B
that
C
which
D
why