用所给的动词适当形式填空。
1. I am ____ (play) the guitar.
2. She is____ （tell ）a story.
3. He is ______ （sing）a song.

看，他们正在踢足球：Look! They are___________(walking /playing) football.

用词的适当形式填空。
【小题1】Asia has the ________(large) population.
【小题2】Africa is the _______ (hot) continent in the world.
【小题3】There was a little note. It _____ (say), “Thank you.”
【小题4】Santa Claus is_______ (finish) his travels around the world.
【小题5】There are all ______ (kind) of cakes in the restaurant.

The children are a map of the zoo. (  )

A．read

B．reading

C．reads

The birds are ______ (fly) in line in the sky.