单项选择题

Because of the great speed of light, we see a lamp light up almost at the exact moment______.

A．we turn it on
B．when we turn on it
C．that we turn on it
D．which we turn it on
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单项选择题
The new edition of the encyclopedia______ many improvements, which is the result of the persistent effort of all the compilers.
A．embedded
B．embodied
C．enchanted
D．enclosed
单项选择题
Our company decided to______ the contract because a number of the conditions in it had not been met.
A．destroy
B．resist
C．assume
D．cancel
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