Fill in am, is or are. ! the sky is very blue today. 2. i not tired. 3. this shelf __very heavy. 4. these shelves very heavy. 5. the child asleep. 6. look ! this_ mabel. 7. i cold. can you shut the window, please? 8. the castle one thousand years old. 9. my brother and i good tennis players. 10. amy at home but her parents in church, 11. a student. 12. my sister an archeologist.