题目内容

The dog is running ____ the grass.

A. across
B. cross
C. crosses

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There is an electric ____ in the kitchen.

A. cook
B. cooker
C. cookers

A ____ is sweeping the floor.

A. cleaning
B. clean
C. cleaner

He is cleaning his ____.

A. teeth
B. tooth
C. tooths

He is putting on his ____.

A. trouser
B. trousers
C. trouserses

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