单项选择题

If a scientist holds an idea to be true and finds any counter evidence whatever, the idea is either______ or abandoned.

A．testified
B．ascertained
C．violated
D．modified
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单项选择题
The house______ ready today but there has been a builders' strike it is still only half finished.
A．was to be
B．was to have been
C．were to be
D．should be
单项选择题
We desire that the tour leader______ us immediately of any changes in plans.
A．inform
B．informs
C．informed
D．has informed
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