the boy and the dog ( ) are paying on the playground填什么

the boy and the dog ( ) are paying on the playground填什么 句子分析：They are paying basketball on the playground. the boy （ ） on the playground now. The c____ on the playground are tall and strong. ____the moment they are playing on the playground 填介词 The boys are running on the playground 有什么错误 1.-Are David and Tony playing football on the playground? the teacher made the boy stand on the playground the boy are play musical chairs on the playground.用what提问 The boy keep to run on the playground after class I'm watching the boy and the dog ___are playing on the playg in the playground 和on the playground 有什么区别?