单项选择题

We shall probably never be able to ______ the exact nature of these sub-atomic particles.

A．assert
B．impart
C．ascertain
D．notify
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单项选择题
Please don’’t______ too much on the painful memories. Everything will be all right.
A．hesitate
B．linger
C．retain
D．dwell
单项选择题
Doing your homework is a sure way to improve your test scores, and this is especially true ______it comes to classroom tests.
A．when
B．since
C．before
D．after
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