Whatwillpeopledieofin100years?

What will people die of in 100 years? If you think that is a simple question, you ______ attention to the revolution taking place in biotechnology．

A．have not been paying	B．had not been paying
C．were not paying	D．will not be paying

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Everyone here will thank the firefighter for the things they have done to prevent fires______ the environment safer.

A．make

B．to making

C．to make

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　 ----____ No. I’d rather he ____there instead of me.

A．go;went

B．to go ;will go

C．go;will go

D．going;shall go

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A．do

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A．were canceled	B．had been canceled
C．having canceled	D．having been canceled

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