Topic 2 A few students are running around the playground,Unit 5 Our School Life,Section A,do his homework,listen to music,sing a song,run,doing his homework,listening to music,singing a song,runing,do some cleaning,swim,dance,read a book,doing some cleaning,swimming,dancing,reading a book,Look, what is he doing,He is running,What are you doing,I am dancing,A: What are you doing? B: I am .ing,Look, what is he doing,He is running,What are you doing,I am dancing,A:Are you .ing? B: Yes,I am./No,Im n