单项选择题

(If) the experiment succeeds or fails, it will (provide us with) (valuable) experience, which is essential to (improving) our future work.

A．If
B．provide us with
C．valuable
D．improving

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单项选择题

The unit of (measurement) known as foot (has) originally based on the average (size) of the human (foot).

A．measurement
B．has
C．size
D．foot

单项选择题

The news of the air crash is not yet ______ by the government.

A．committed
B．confirmed
C．considered
D．concerned

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