Đáp án tham khảo có thể sai: 1b, 2c, 3a, 4b, 5e, 6e, 7d, 8b, 9d, 10c, 11a, 12a, 13c, 14b, 15b, 16a, 17d, 18b, 19a, 20c, 21d, 22c, 23d, 24d, 25c, 26f, 27a, 28a, 29a, 30a, 31a, 32a, 33a, 34a, 35c, 36a, 37b, 38b, 39b, 40b, 41a, 42d, 43b, 44d, 45a, 46a, 47c, 48b, 49d, 50a, 51c, 52a, 53a, 54b, 55b...