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1. Is, is
2. Are, am
3. Is
4. Is, is
5. Is, is
6. Is, is, is
7. Is, are
8. Is, is, is
9. Are
10. Is
11. Are, are
12. Is, is , is

1) She IS a student. She IS a good student.
2) Where ARE you from? - I AM from Moscow.
3) My mother IS not (isn't) teacher.
4) IS your brother at school? - Yes, he IS.
5) My friend IS an engineer. He IS at work.
6) Nick IS not a college student. He IS a school boy. He IS at school now.
7) Helen IS a painter. She has some fine pictures. They ARE on the wall.
8) IS this your book? - This book IS not mine. My book IS in my bag.
9) These ARE his newspapers.
10) My uncle IS an office worker.
11) ARE your parents at home? - No, they ARE not.
12) Michael has a brother. His brother IS 30. He IS a worker. He IS at home.