单项选择题

It is essential that any ideas and development work concerning a possible future ______ application be kept absolutely secret and confidential.

A．authority
B．privilege
C．patent
D．title
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单项选择题
Three months had elapsed before the great invasion plan began to ______.
A．uncover
B．reveal
C．unfold
D．release
单项选择题
It is, however, necessary to hand over a receipt for the last rental ______ in respect of the assignment of leasehold property.
A．division
B．premium
C．installment
D．installation
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