The correct sentences are:

• Andrei and I are not Russian.
• Are you a police officer?
• She's a doctor.
• They're Brazilian.
• My job is interesting.
• We're from Seville, in Spain.
• It's a city in India.
• I'm in London today.
• Taxis are not expensive here.

The following sentences are incorrect:

• Yes, I are. (It should be "Yes, I am.")
• You're a receptionist. (This is not incorrect, but it is not explicitly stated whether it is correct or not. It is not possible to determine whether it is correct without additional context.)
• It are not easy. (It should be "It is not easy.")
• I not from Italy. (It should be "I am not from Italy.")
• Is they from Japan? (It should be "Are they from Japan?")