单项选择题

______ the building did he realize that there was danger everywhere in it.

A. Upon entering
B. When he entered
C. Only after entering
D. After he had entered
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单项选择题
She always put her medication on the top of the shelf lest the children ______ it by mistake.
A. took
B. should take
C. had taken
D. would take
单项选择题
Physics is the present-day equivalent of ______ used to be called natural philosophy, from which most of present day science arose.
A. that
B. all
C. which
D. what
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