Sure! Here are the answers for the blanks in your exercise:

41. He is mad **about** music. (a)
42. This table is made **of** wood. (b)
43. I paid $500 **for** this book. (d)
44. He is different **from** his mother. (a)
45. He told me a long story **about** his adventures. (a)
46. They like to sit **by** the fire. (a)
47. She works **for** her living. (b)
48. He suffers **from** headaches. (a)
49. He is **of** royal blood. (c)
50. She is afraid **of** dogs. (a)
51. He went so fast that I couldn’t keep up **with** him. (b)
52. What’s the matter **with** you? (c)
53. In 1805, England was at war **with** France. (b)
54. All men between 18 and 25 **without** exception are expected to serve in the army during war time. (a)

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