单项选择题

After years of ____________ bee dancing, the scientist found that the dances have certain patterns.

A．gazing
B．watching
C．observing
D．viewing
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单项选择题
The workers' demands are ____________ ; they are asking for only a small increase in their wages.
A．moderate
B．normal
C．inadequate
D．available
单项选择题
Many important discoveries relating to the ____________ of electricity were made in the 18th century.
A．appearances
B．surroundings
C．occurrences
D．phenomena
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