Прочитать сказку про русалочку Ариэль и вставить пропущенные слова could, couldn't, had.

At the beginning of the story Ariel had no legs, but she ______ a tail. So she ______ walk, but she ______ swim. She also ______ sing very beautifully. Later Ariel asked Ursula to give her legs and take her voice instead. Then Ariel ______ legs, but she ______ no tail. She ______ walk, but she ______ sing. A sad story, isn't it?