They were surprised that a child could work out the problem____they themselves couldn't. 　　

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-∞＜χ²＜+∞ 0≤χ²≤+∞ χ²≤1 -∞≤χ²≤0 χ²≥1

surprising；surprised surprising；surprising surprised；surprising surprised；surprised

What; was What; were That; was That; were

knew had known have known were known

surprised ; surprised surprising ; surprising surprised ; surprising surprising; surprised

were surprised were worried about burst into laughter couldn’t help laughing

surprised；surprised surprising；surprising surprised；surprising surprising；surprised

What; was What; were That; was That; were

χ12 =χ22 χ12 ＞χ22 χ12 ＜χ22 χ12 比χ22准确 χ22 比χ12准确

surprises; surprised surprises; surprising surprise; surprised surprise; surprising

were surprised were worried about burst into laughter coulnd’t help laughing

had been surprising 　 were surprising 　 were surprised 　 had been surprised

surprises;surprised surprises;surprising surprise;surprised surprise;surprising

were at were was at was

-∞<χ²<+∞ -∞<χ²<0 0χ²<+∞ -1<χ²<1 χ²≤1

surprise, surprised surprise, surprising surprised, surprising surprising, surprised

surpring, surprised surprised, surprising surprised, surprised surpring, surprising

surprise surprising having surprised surprised