These apple trees ______ I planted three years ago，have not borne any fruit.
A. which
B. as
C. such
D. whose
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The house, _______we bought last month, is very nice.
A. that
B. which
C. where
D. in which
The man ______left leg broke in the match used to be a football player.
A. whose
B. who
C. whom
D. that
He is an American astronaut ______ was the first man to set foot on the moon.
A. which
B. whom
C. whose
D. who
My sister, ______ is a teacher, always encourages me to study hard.
A. for whom
B. who
C. whose
D. whom
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