This is Jim. He is thirteen. He is from the USA. He is a student. He has a good friend. His name is Jack. Jack is fifteen. He is from Canada. Jack is tall but Jim is short. They are in the same class, but they are in different grades. Jim is in Class Two. Jack is in Class Two, too. They go to school at seven in the morning and go home at six in the afternoon. ,. Jim and Jack are   _  .
sisters friend teacher and student from different countries