The ___________ teacher is very young.
A. studnets's
B. students'
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The supermarket is in ____________.
A. the center of the city
B. the city's center
There are many of ___________ in the Chinese textbook.
A. Du Fu's and Li Bai's poems
B. Du Fu and Li Bai's poems
It will be sunny according to ___________.
A. the weather report of today
B. today's weather report
My mother bought _______ for the weekend.
A. four pound of beef
B. four pounds of beef