单项选择题

Try ______ the green button to see if the machine will start.

A．press
B．to press
C．pressing
D．to have pressed
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单项选择题
Not only was the paper money ______ which Napoleon so graciously distributed to the unfortunate, but even silver lost its value in relation to gold.
A．invaluable
B．valueless
C．priceless
D．valuable
单项选择题
He brought off the first prize in the speech contest. Without your help, he ______.
A．would succeed
B．will succeed
C．would not succeed
D．would never have succeed
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