题目内容

_______ his mother, the baby could not help _______.

A. To see; to laugh
B. Seeing; to laugh
C. Seeing; laughing
D. To see; laughing

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Anything worth _______ is worthy of _______ well.

A. doing; being done
B. doing; doing
C. to be done; to be done
D. to be done; being done

____ is not easy.

A. For cook
B. To cooking
Cooking
D. Cook

China is a ____ country.

A. developing
B. develop
C. developed
D. being developed

Things keep ____.

A. changed
B. changing
C. being changed
D. change

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