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______is estimated that a round-trip to Mars would take more than a year.
A,That B,what C,There D,It

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Mr. Lee, who as a guide for over 10 years, is now a manager in a big travel agency.

A．worked

B．has worked

C．had worked

D．works

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In the school hall, where a meeting , some students are busy preparing for it.

A．is held

B．has been held

C．is being held

D．is to be held

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the coming English speech competition will be a lot of work, so I need some volunteers to help out.

A．Organize

B．Organizing

C．Organized

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Rock-climbing is a breathtaking activity, very popular nationwide among young people,
cooperation as well as courage plays an important role.

A．who

B．which

C．that

D．where

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Your advice was a great help to us, without which all our efforts .

A．wouldn’t pay off	B．hadn’t paid off
C．wouldn’t have paid off	D．didn’t pay off

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