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
Every device______ in the spacecraft must be designed and made with great care so as to be sure that nothing goes wrong in operation.
A．to be fitted
B．fitted
C．fitting
D．to have been fitted
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