This is the same girl _____ came to borrow an English book two days ago.
A. who
B. which
C. what
D. that
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Tom's sister is the girl ______ an English song in the next room .
A. who is singing
B. is singing
C. was singing
D. singing
This is _____ useful book. I've read it for _____ hour.
A. an, /
B. an, an
C. a, an
D. an, the
The teacher told his classlight travels faster than sound.
The man ______ (who/what) you saw yesterday is a doctor from Beijing.