They talked for about an hour of things and persons _____ they remembered in the factory.
A. which
B. that
C. who
D. whom
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We are going to spend this Spring Festival in Beijing, _____ live our grandparents and some relatives.
A. which
B. that
C. who
D. where
There are many areas in the world _____ lack experienced doctors.
A. where
B. in which
C. which
D. what
The years and months _____ we spent together are really wonderful to us all.
A. when
B. on which
C. in which
D. that
_____ has been described above, it is a general rule that solids expand as the temperature increases and contract when they are cooled.
A. It
B. As
C. That
D. Which