She'll never forget her stay there ________ she found her son who had gone missing two years before.
#75565
A
that
B
which
C
where
D
when
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The foreign guests spoke highly of the children and their shows ___________ they saw in the kindergarten.
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A
what
B
who
C
that
D
which
There is a system ________the waste is disposed of using the principles of ecology.
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A
which
B
where
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that
D
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My father and his teacher talked a lot about the things and persons ___ they could remember.
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A
who
B
which
C
what
D
that