单项选择题

It is important to take ______ when using dangerous tools such as chain saws.

A．precautions
B．details
C．concepts
D．intentions
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单项选择题
With a radical new design, the Dust Buster 109 is far more effective than ______ vacuum cleaners.
A．convening
B．convention
C．convenient
D．conventional
单项选择题
Sales employee Jed Roberts ______ late to the office more than 5 times so far this year.
A．arrives
B．arrived
C．has arrived
D．had arrived
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