单项选择题

Writing is a slow process ,requiring ______ thought, time and effort.

A．considerable
B．significant
C．enormous
D．numerous
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单项选择题
It has been ______ that the weight of all the insects destroyed by spiders in Britain in one year would be greater than the total weight of all the human beings in the country.
A．calculated
B．estimated
C．measured
D．valued
单项选择题
He was very ______ to go, but he has no other choice.
A．reluctant
B．willing
C．eager
D．keen
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