单项选择题

Most of the leading search engines are ______ in terms of the length of time in which they return results.

A．impressed
B．competitive
C．advisable
D．spacious
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单项选择题
Employees on day shifts may use the computer lab at any time, but ______ who work at night should obtain a manager s permission.
A．somebody
B．these
C．them
D．those
单项选择题
It is advisable to look for a professional consulting service when executives are ______ about future market trends.
A．unknown
B．unavailable
C．unable
D．unsure
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