71c who

72a which

73a whose

1 The man whom I shouted at didn't come back again

2 The television which i dropped never worked again

4 The clothes which she bought were beautiful

5 The wall which we built fell down after three weeks

6 The policeman whom I asked wasn't very helpful 

7 I didn't really like the car which we bought

8 I lost the money which I borrowed from John

9 She is the most intelligent that I have ever met

10 This doctor whom you visited yesterday is famous

51b who he

52d which he 

53c whose

54d which 

55b whom

56a which

57c why

58d that

59d that

60c which

I.1 heavier

2 bigger

3 more beautiful

4 better

5 safer

II.6. hotter

7 more dangerous

8 happier

9 more expensive

10 more boring

TL:

1. The man whom I shouted at didn't come back again

2. The television which i dropped never worked again

4. The clothes which she bought were beautiful

5. The wall which we built fell down after three weeks

6. The policeman whom I asked wasn't very helpful 

7. I didn't really like the car which we bought

8. I lost the money which I borrowed from John

9. She is the most intelligent that I have ever met

10. This doctor whom you visited yesterday is famous

Exercise 5:

51. B

52. D

53. C

54. D

55. B

56. A

57. C

58. D

59. D

60. C

I.

1. heavier

2. bigger

3. more beautiful

4. better

5. safer

II.

6. hotter

7. more dangerous

8. happier

9. more expensive

10. more boring