Sure, here are the correct options for each sentence:

41. I regret **to say** that you have failed the test.
42. They were fined several times, but they keep **littering**.
43. He had to prepare **to catch** a train for New York.
44. We delayed **going** to Tokyo because of bad weather.
45. She likes that highland city so much that she keeps **going** back there.
46. You may want to consider **changing** the lock of your room.
47. Henry proposed **starting** the project next week.
48. They postponed **holding** the presidential election to November 11th.
49. The bed seemed **to occupy** most of the room.
50. My brother denied **eating** my cake. Maybe a mouse ate it.
51. My parents like **going** for long walks on Saturday morning.
52. Susan meant **to give** me the pen, but she forgot.
53. The doctor told my grandma to avoid **bending** hard.
54. The sun appears **to move** in an arc across the sky.
55. Mr. Henry was pretending **to call** someone.
56. Most people eat **to live**, but some people live to eat.
57. I excused **having** to wear a dress as most girls wear trousers.
58. Ms. Helena offered **to take** me to the airport.
59. I tried **to persuade** her to come but it was no use.
60. How much money would be saved if they delayed **opening** schools?