给下列句子选择合适的答语。
(1)What is he doing?A I’m riding a bike.
(2)What are you doing?B She’s listening to music.
(3)What are they doing?C He’s writing a letter.
(4)What is Amy doing?D They are rowing a boat.
Amy is and .
A. running jumpingB. run jumping C. runing jumping
The panda is fruit.
A. eatB. eatting C. eating
What the elephant doing?
A. isB. are C. am
The horse is .
A. runB. runningC. running