Hue citadel is one of the most famous (21) ..................in Vietnam. There used to be many citadels in Vietnam, but now there are only a few left. A citadel is similar (22)………….. a castle. They were homes for kings and queens. Hue citadel is the home of many (23) ...............and their families. It was built in the 19th 9 (24) ....................and was mainly made from wood and (25)................ The walls were made from strong bricks to keep the kings and their families (26)………….. It doesn’t have many dungeons, but it has a ( 27) ............... around it. Every year, thousands of people (28) ................the citadel and explore the beautiful rooms and gardens. 21. A. citadel B. citadels C. building D. buildings 22. A. in B. on C. at D. to 23. A. chefs B. sailors C. leaders D. kings 24. A. decade B. century C. millennium D. years 25. A. wood B. tree C. plant D. bricks 26. A. safe B. safely C. safety D. unsafe 27. A. room B. house C. cabin D. moat 28. A. go B. meet C. get D. visit