题目内容

A ____ is sweeping the floor.

A. cleaning
B. clean
C. cleaner

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He is cleaning his ____.

A. teeth
B. tooth
C. tooths

He is putting on his ____.

A. trouser
B. trousers
C. trouserses

These ____ are cooking a meal in the kitchen.

A. cooker
B. cook
C. cooks

The keyboard operators are typing ____ on the computers.

A. letters
B. letter
C. a letter

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