Emma is cooking a meal ____ us.
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Mr.Liu and his wife are looking at ____.
A. them
B. they
C. their
The dog is running ____ the grass.
A. across
B. cross
C. crosses
There is an electric ____ in the kitchen.
A. cook
B. cooker
C. cookers
A ____ is sweeping the floor.
A. cleaning
B. clean
C. cleaner