The teacher set such a difficult problem ________none of us could solve.
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A
that
B
so that
C
which
D
as
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The Nuclear Security Summit is an initiative of Mr. Obama, considers nuclear terrorism to be one of the greatest threats to international security.
#75167
A
which
B
what
C
who
D
whom
Xinjiang is one of the areas sandstorms happen most often, results from a dry climate, vast desert and a strong wind.
#76569
A
where; which
B
when; that
C
where, that
D
that; which
In western culture,21 was the age________ young people traditionally received a key to their parents’ door, as a symbol of entering adulthood.
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A
in which
B
on which
C
at which
D
to which
Playing basketball is a sport _________ working as a team matters more.
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A
where
B
that
C
which
D
what