Asisknowntous,theoryisbasedonp

As is known to us, theory is based on practice and     servers practice.
A. by chance B. in turn   C. in return C. by turn

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At the head of the procession _______, each holding a red flag in his or her hand.

A．the Young Pioneers marched	B．marched the Young Pioneers
C．did the Young Pioneers march	D．where marched the Young Pioneers

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— Look, there ______.
— Oh, there _______.

A．comes the bus... comes it	B．the bus comes... it comes
C．comes the bus... it comes	D．the bus comes... comes it

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_______, we continued our way.

A．As terrible the storm was	B．Terrible as the storm was
C．As terrible was the storm	D．Terrible the storm as was

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________ in Tibet for ten years, he has been accustomed to the life and the climate there.

A．He has worked	B．Having worked
C．He has been working	D．Working

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Look! What a mess the room is! In my opinion, it needs ______.

A．cleaning up

B．being cleaned up

C．to clean up

D．clean up

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