Those are ______.(    )

A．mouthes

B．mice

C．deers

用所给词的正确形式填空。
【小题1】They visited “The World of Robots” on the __________ (two) floor.
【小题2】Alice is good at dancing. She is a good __________ (dance).
【小题3】Peter __________ (buy) a model plane yesterday.
【小题4】He __________ (can) eat five hamburgers a day ten years ago.
【小题5】Horses can run very __________ (fast).

This is a_____.( )

A．car

B．cars

The girls of Grade One are good ________.(  )

A．runner

B．running

C．runners

Look at those ___over there.  (   )

A．ducks

B．duck

C．three ducks