单项选择题

For workers in small firms employment ________ are very rare, working hours are longer and safety records poor.

A．guarantees
B．reservations
C．securities
D．assumptions
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单项选择题
When confronted with such questions, my mind goes ________, and I can hardly remember my own date of birth.
A．dim
B．faint
C．vain
D．blank
单项选择题
Although the false banknotes fooled many people, they did not ________ to close examina tion.
A．look up
B．pay up
C．keep up
D．stand up
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