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