单项选择题

Samples of this article will be sent to you free ______.

A．of accord
B．on request
C．for payment
D．in advance
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单项选择题
The impact of Thoreau' s On the Duty of Civil Disobedience might not have been so far reaching ______ for Elizabeth Peabody, who dared to publish the controversial essay.
A．it not being
B．if it has not been
C．if it were not
D．had it not been
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Scientists, like other people, are always pleased to have their own ideas ______.
A．validating
B．to be validated
C．validated
D．being validated
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