Itstenyearssincethescientiston

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It's ten years since the scientist _______on his life's work of discovering the valuable chemical.

A．made for

B．set out

C．took off

D．turned up

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Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.

A．it, it	B．what, what
C．it, what	D．what, it

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. ------Don’t put the waste on the ground.
------Oh, I’m very sorry. I ____ the dustbin there.

A．don’t see

B．isn’t seeing

C．didn’t see

D．haven’t seen

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------When can I see you, Mr Black? Three o’clock this afternoon?
------Oh, no. I _____ a meeting then.

A．will have

B．will be having

C．am having

D．have

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You have to wait till tomorrow when our manager ____ back.

A．will come

B．comes

C．came

D．come

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E-Mail is a _____of communication and it is becoming more and more popular.
A. type B. meanC. meansD kind

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