单项选择题

To what extent will future scientific discoveries make possible the ______ of the human life span

A. increase
B. expansion
C. growth
D. prolongation
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单项选择题
Adictionary of the English language, ______ by Dr. Samuel Johnson, was the first real attempt as a systematic written survey of English usage.
A. compiled
B. composed
C. concocted
D. collected
单项选择题
If you have never planted anything, you won't be able to know the pleasure of watching the thing you have planted ______.
A. grow
B. to grow
C. growing
D. to be growing
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