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