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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单项选择题
I don't believe you are going to have the matter looked into today,______
A．are you
B．do you
C．arch' t you
D．don' t you
单项选择题
Possessing a car gives a much greater degree of______, enabling the driver to move around freely.
A．travelling
B．movement
C．mobility
D．freedom
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