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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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--You are always full of ________. Can you tell me the secret?
--Taking plenty of exercise every day.

A．power	B．energy
C．force	D．strength

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The reason _____ they held a party was _____ it was Sue’s birthday.

A．why; because	B．why; that
C．that; that	D．that; because

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When the question was under discussion, Gloria _____ an idea that the prices of cars should be reduced.

A．came about	B．came up with
C．came out	D．came up to

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--Why doesn’t Sam come here with you?
--I’m sorry, but he _______ from ill health at the moment.

A．suffers	B．suffered
C．is suffering	D．was suffering

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As teenagers of the 21st century, we should be ready to _____ the challenge of society.

A．put	B．do
C．make	D．meet

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