Đáp án tham khảo, có thể sai: 1b, 3a, 4a, 5a, 6d, 8a, 10a, 11b, 12a, 13a, 15b, 16a, 17a, 18c, 19d, 20d, 21b, 22a, 23d, 24a, 26a, 27c, 28b, 29acd, 30a, 31d, 32b, 33b, 34d, 35b, 36c, 37c, 38a, 39b, 40a, 41a, 42c, 43c, 44a, 45e, 46b, 47d, 48b, 49a, 50a, source : NLP301c_TE2_SU23_709056