Ответ:

  1. This is your atlas. This is yours.
  2. This is his scooter. This is his.
  3. This is her camera. This is hers.
  4. This is its plate. Вторая часть с абсолютным притяжательным местоимением не образуется: у its нет такой формы.
  5. These are her keys. These are hers.
  6. These are their books. These are theirs.
  7. These are my bags. These are mine.