单项选择题

Key resources are technical personnel and aircraft spare parts which account for the largest share of the maintenance ______.

A．expenditure
B．budget
C．allowance
D．investment
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单项选择题
It is unlikely that enough qualified teachers will be found unless there is ______ improvement in salaries and conditions of housing.
A．innumerable
B．subtle
C．extensive
D．substantial
单项选择题
The workers' promised wage increase is being ______ while it is examined by the government to see if it is greater than the law allows.
A．put back
B．held back
C．put down
D．held down
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