单项选择题

The Sparkling Cleaning Company, Inc. recently introduced a laborsaving device that automatically sweeps and ______ the floor.

A．polishes
B．pours
C．flows
D．presses
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单项选择题
The union leaders decided that they would not return to the company next week ______ the management increased their pay.
A．unless
B．in order
C．despite
D．except
单项选择题
Public speaking experts stress that successful ______ of a speech requires a great deal of skill and preparation.
A．deliver
B．delivery
C．deliverable
D．delivered
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