therearelivingcreaturesintheou

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___ there are living creatures in the outer space as those on Earth hasn’t been proved until now.

A．How

B．When

C．Where

D．Whether

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Laura was away in Paris for over a week.When she got home，there was a pile of mail ________for her.

A．waited	B．to wait
C．waiting	D．was waiting

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The room is empty except for a bookshelf ________ in one corner.

A．standing	B．to stand
C．stands	D．stood

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In some languages,100 words make up half of all words ________ in daily conversations.

A．using	B．to use
C．having used	D．used

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A．change	B．changing
C．changed	D．to change

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A．Not knowing	B．Knowing not
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