Exercise 1
1.b 2.a 3.a 4.c 5.c 6.b 7.b 8.c 9.a 10.b 11.a 13.c 14.b 15.c
16.a 17.c 18.a 19.b 20.a21.c 22.a 23.a 24.a 25.b 26.c 27.b
28.c 29.b 30.c 31.b 32.b 33.a 34.b 35.a 36.c 37.b38.a 39.c
40.a 41.b 42.b 43.c 44.b
Exercise 2
45.g 46.c 47.f 48.a 49.b 50.e
Exercise 3
51.b 52.f 53.d 54.e 55.c
Exercise 4
56.a 57.b 58.b 59.a 60.b 61.a
Exercise 5
62.were stopping 63.said 64.started 65.were going 66.saw
67.was holding 68.was singing 69.were 70.did he 71.decided
Exercise 6
72.d visit-visited 73.a are-is
74.c on-in 75.b have-also
76.c but-and 77.b fastly-fast
78.c a-an 79.a fortunately-unfortunately
80.d having-have
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