Was it 80 years before Christopher Columbus crossed the Atlantic ______ Zheng He hadsailed to East Africa?
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A
when
B
that
C
after
D
since
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It was in the school ____ he had studied ____ he began the important experiment.
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A
that; where
B
in which; which
C
where; that
D
where; in which
It was only after he had read the papers Mr. Gross realized the task before him was extremely difficult to complete.
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A
when
B
that
C
which
D
What
It is only with the help of scientific research _____ bring PM1 air pollution under control.
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A
that we will
B
we will
C
that we do
D
do we
— ______you write so well? —By reading and keeping diaries every day.
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A
How is it
B
What is it
C
How is it that
D
What is it that