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With the help of high technology, more and more new substances____in the past years.

A．discovered

B．have discovered

C．had been discovered

D．have been discovered

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He sent me an e-mail, _______ to get further information.

A．hoped

B．hoping

C．to hope

D．hope

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What surprised me most was to see some of the village people ______ on the benches at the end of the classroom .

A．seated

B．seating

C．seat

D．to be seating

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—Can I look at the menu for a few more minutes before I decide?
—Of course. ______, sir.

A．Make yourself at home	B．Take your time
C．It doesn’t matter	D．Enjoy yourself

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_______ person who is responsible for his work will react quickly in _______ emergency.

A．A; /

B．A; an

C．The; /

D．A; the

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—We’ve finally found the solution with the help of Hans! It’s really great!
—____, you know.

A．Two heads are better than one	B．Birds of a feather flock together
C．The early bird catches the worm	D．Great minds think alike

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