单项选择题

The best way（）the principle is to see how it actually works in practice.

A．understood
B．understand
C．understanding
D．to understand

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单项选择题
It is no use（）with him, because he will never change his mind.

A．arguing
B．argue
C．argued
D．to have argued
单项选择题
Only by shouting at tile top of his voice（）

A．was he able to make himself hear
B．he was able to make himself hear
C．he was able to make himself heard
D．was he able to make himself heard
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