．lifebeganontheearthisoneofthe

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．_________life began on the earth is one of the biggest puzzles to scientists.

A．How

B．What

C．Where

D．That

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A．all of them	B．all of who
C．none of whom	D．both of them

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

A．why; because	B．why; that
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--I was very ________my mother’s illness. I stayed awake last night.

A．concerned about	B．concerned with
C．concerned in	D．concerned to

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I _____ in the street when someone _____ me.

A．walk; called	B．walking; calling
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