one day when bob was ( ) in the yard

playing
heard 听到
再问： hello bob ! bob ( ) around
再答： isn't
再问： he couid ( ) WAS ...........just then a ( ) looked
再答： 句子不全，填不进去啊，而且也没有词性范围
再问： he couid ( ) WAS just a big bird on the tree .just then a ( ) looked out of the window and saw bob and the bird.
再答： 你这个应该是一篇文章吧，你不能把它分成这样一句一句的，否则没法填的，要是这样的话前面就k可能是bob turned around, he could see there was ust a big bird on the tree .just then a ( man ) looked out of the window and saw bob and the bird.(你要知道确定答案应该把整个文章发来，不然我不能保证正确）
再问： one day when bob was ( ) in the yard,he( ) someone call him.hello bob ! bob ( ) around,bob ( ) around
再答： playing, heard, turned