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Ответ:

51. That

52. is cleaning

53. Can

54. is

55. isn't

56. can't

57. children

58. doesn't

59. hasn't got

60. his

61. my

62. These

63. Sally's

64. is sleeping

65. teeth

66. his

67. Can

68. is

69. do

70. has got

71. B)

72. A)

73. C)

74. B)

75. A)

76. C)

77. A)

78. B)

79. C)

80. A)

Учись, чувак ))