Ittookalongtimefortheeffective

It took a long time for the effective use of natural gas_________．

A．to be made

B．to make

C．being made

D．making

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The headmaster suggested the problems referred __________ discussed immediately.

A．should be

B．to be

C．be

D．to being

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A．that

B．which

C．what

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—In no way ___________give up.

A．I shall

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C．shall I

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A．left out

B．held out

C．set out

D．made out

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A．who

B．about which

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