单项选择题

It would be very difficult for a library to be without dictionaries and encyclopedia; such reference books are______.

A．unavoidable
B．inevitable
C．indispensable
D．fundamental
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单项选择题
While the total number of farmers engaged in the agriculture production is barely half ______it used to be in 1959, the size of the average farm has tripled.
A．that
B．what
C．which
D．how
单项选择题
He did poorly in his examination,______ how hard he had studied for them.
A．considering
B．to consider
C．thinking
D．regarding
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