21.- your aunt a doctor? — yes, she . a) are, am b) am, is c) is, is 22. they at home? — no, they not at home, they at work. a) is, are, is b) are, are, are c) am, is, are 23. my brother a worker. he at work. a) is, is b) am, are c) is, are 24. you an engineer? — yes, i a) is, am b) are, am c) is, are 25. your sister a typist? — no, she not a typist, she a student. a) are, are, are b) is, am, am c) is, is, is 26. your brother at school? — yes, he . a) is, is b) are, am c) are, are 27. your sister at school? — no, she not at school. a) are, am b) is, is c) are, is 28. this your watch? — yes, it . a) are, is b) is, are c) is, is 29. my uncle an office-worker. a) are b) is c) am 30. helen a painter. she has some fine pictures. they on the walls. she has much paper. it on the shelf. the shelf brown. it on the wall. helen has a brother. he a student. he has a family. his family not in st. petersburg, it in moscow. a) is, are, is, is, is, is, is, is b) are, is, is, is, am, am, am, are c) are, am, is, is, is, are, am, are