单项选择题

Shares on the stock market have （） as a result of a worldwide economic downturn.

A．turned
B．changed
C．floated
D．fluctuated

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The tenant left nothing behind except some （） of paper, cloth, etc.

A．sheets
B．scraps
C．pages
D．slices
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Whenever possible, Ian （） how well he speaks Japanese.

A．shows up
B．shows around
C．shows off
D．shows out
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