III
21 a
22 a
23 a
24 a
25 b
26 b
27 c
28 c
29 должна быть форма had received
30 d
IV
31. Ann didn't pick up the phone because she was dealing with another customer when it rang.
32. While he was travelling in South Africa, he got the idea for his new movie.
33. It rained yesterday.
34. It was raining all day yesterday.
35. When we returned from London it had been raining for 3 hours.
36. When we returned from London it didn't rain any more.
37. He had graduated from the University before he moved to Moscow.
38. He graduated from the University last year.
39. When he came home his family was waiting for him.
40. They had been driving all night when finally they saw the lights of a big city.
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