aboutthiscomputerprogram,ahuge

　　　　about this computer program, a huge amount of time and energy　　　　.

A．Should I know; be saved

B．If I had known; can be saved

C．Had I known; would have been saved

D．Did I know; was saved

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There's a man at the reception desk who seems very angry and I think he means ________trouble.

A．making

B．to make

C．to have made

D．having made

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I often see lights in that empty house. Do you think I________report it to the police?

A．should

B．may

C．will

D．can

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Mr. White________at 830 for the meeting, but he didn't show up.

A．should have arrived

B．should arrive

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A．can

B．will

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—Thanks. You________it. I could manage it myself.

A．needn't do

B．needn't have done

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D．shouldn't have done

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