Ответ:

  1. Rosa is Brazilian.
  2. I am Irish.
  3. They are from Spain.
  4. Bob's favourite hobby is reading.
  5. Mario and Rosa are from Italy.
  6. We are from America.
  7. You are Italian.
  8. He is from Argentina.
  9. Kate and Bob's favourite sport is football.

Правило: am употребляется с I, is — с существительными и местоимениями в единственном числе, are — с you, we, they и формами множественного числа.