Noonehasyetsucceededinsolvingt

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No one has yet succeeded in solving the _____ of how life first began.

A．biology

B．gravity

C．puzzle

D．theory

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This factory produces about one million pairs of shoes each year, 60% ____ are sold abroad.

A．of them	B．of that
C．of whom	D．of which

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I don't like the way ________ you laugh at her.

A．which	B．in which
C．by which	D．on which

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________ you've got a chance, you might as well make full use of it.

A．Now that	B．After
C．Although	D．As soon as

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—Should I water the flowers every day?
—Yes. Most house plants require ________regularly.

A．watering	B．being watered
C．to water	D．to be watering

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He remembered ________to Shanghai when he was a child, but he had an unclear impression now.

A．to take	B．taking
C．having taken	D．being taken

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