In the past few _____, there has been a great increase in the amount of research done on human brain.
A. ten years
B. decade
C. ten year
D. decades
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The population of Shanghai is three times as large as__________Nanjing.
A. those of
B. /
C. that of
D. that in
The player’s ______ to the music is quite different from anyone else’s.
A. challenge
B. approach
C. mean
D. meaning
______ is necessary for an art student to reach out for raw material before he sets to draw.
A. This
B. What
C. It
D. That
Not until he thought of himself as a mature director ______that film.
A. he undertook
B. did he undertake
C. that he undertook
D. did he undertook