The book was written in 1946, ____ the education system has witnessed great changes.
#70115
A
when
B
during which
C
since then
D
since when
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The astronaut did many experiments in the spaceship, great help for knowing more about space.
#70039
A
which we think it is
B
which we think is of
C
of which we think is
D
we think which is of
_______ your diet, it is easy to reduce.
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A
Watching
B
To be watching
C
If you watch
D
To have watched
I think the biggest problem in banning smoking is ______ people can buy cigarettes easily.
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A
that
B
whether
C
where
D
how
. _____is known to us all, America is a developed country____ the first world.
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A
As; belonging
B
which; belonged
C
as; belonging to
D
which; belonged to
Liu Xiang’s breaking the world record was an exciting moment, _______all of us will never forget.
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A
that
B
one
C
it
D
what