But later people developed a way of printing, ____

But later people developed a way of printing, _____rocks.

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used

using

and use

uses

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Chen Xiexia is the first Chinese athlete ______ the gold medal in the Beijing Olympic Games.

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winning

to win

wins

won

. Peter received a letter just now __________ his grandma would come to see him soon.

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said

says

saying

to say

—Please go on with your demonstration．—But where was I?—Well, you_____the two chemicals together．

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tried to mix

were trying to mix

were trying mixed

had tried to mix

Nankai University,_______ in 1919, has a history of more than 94 years.    (     )

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found

founding

founded

to be founded

It is no use       without taking any measures.

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cry

crying

to cry

cried