Đáp án:

1c 2d 3d 4d 5c 6d 7a 8b 9b 10d 11d 12b 13c 14c 15b 16d 17c 18d 19d 20c 21c 22d 23d 24d 25c 26b 27d 28b 29c 30a 31a 32b 33a 34d 35c 36b 37c 38d 39c 40c 41d 42c 43b 44a 46d 47d 48d 49d 50b 51a 52a 53c 54c 55a 56d 57d 58d 59a 60a 61d 62d 63d 64d 65d 66c 67d 68c 69b 70b