单项选择题

Mr. Scott asked for an assistant because his work load was too ______.

A．preoccupied
B．onerous
C．trifling
D．omnipresent
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单项选择题
All the commodities sold in that shop are given one year's ______.
A．assurance
B．warrant
C．guarantee
D．insurance
单项选择题
People of all countries are expected to ______ the principles of the United Nations and defend the peace in the world.
A．inspect
B．expedited
C．uphold
D．reinstall
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