﹣Youareagreatswimmer．﹣Thanks．I

﹣You are a great swimmer．

﹣Thanks．It's because I ______ a lot these days．（　　）

A．	have been practising	B．	was practising
C．	would practise	D．	had practised

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A sudden stop can be a very frightening experience，______ if you are travelling at high speed．（　　）

A．

eventually

B．

strangely

C．

merely

D．

especially

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When their children lived far away from them，these old people felt ______from the world．（　　）

A．	carried away	B．	broken down
C．	cut off	D．	brought up

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Scientists have advanced many theories about why human beings cry tears，none of ______ has been proved．（　　）

A．

whom

B．

which

C．

what

D．

that

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To return to the problem of water pollution，I'd like you to look at a study _______ in Australia in 2012．（　　）

A．	having conducted	B．	to be conducted
C．	conducting	D．	conducted

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Silk ______ one of the primary goods traded along the Silk Road by about 100BC．（　　）

A．	had become	B．	was becoming
C．	has become	D．	is becoming

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