Giúp mik với ạ :( câu trả lời và lí do vì sao chọn 1. It is said that royal citadel.....as a unesco world heritage. A were listed. B. Is listed. C. list. D. listing 2. Hoa lư....in trang an landscape complex in the 10th and 11th centuries AD. A. Establisehed. B. establishes. C. Was establisehed. D. is established 3. The tour guide suggest that Kelly.... One pillar pagoda when arriving in ha nội. A. Visiting. B. Should visit C. To visit. D. Visited