Ответ:

Краткие ответы должны содержать соответствующую форму глагола to be.

  1. Is this album expensive? — Yes, it is.
  2. Is your father at work? — No, he isn’t.
  3. Is the museum open today? — No, it isn’t.
  4. Are your parents from Belarus? — Yes, they are.
  5. Is Kate? — No, she isn’t.

Ответ: 2) he isn’t; 3) it isn’t; 4) they are; 5) she isn’t.