Do you know the year ______thefirstmarathon was held in Xuzhou
A. which
B. that
C. when
D. on which
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The primary school______we'll visit next week is not far from here.
A. where
B. to which
C. which
D. in which
Great changes have taken place since then in the city_______we are living
A. where
B. that
C. which
D. there
They arrived at a country house, in front of ______sat an old man
A. whom
B. who
C. which
D. that
The engineer ______my father works is about 50 years ol
A. to whom
B. on whom
C. with which
D. with whom
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