VI. Read the passage and and choose the best option that best fits each numbered blank: Ha Long Bay is a UNESCO World Heritage Site and popular travel (1) Vietnam. The bay features thousands of limestone karsts and isles in (2) Bay is a center of a larger zone which (3) southwest. in Quang Ninh Province, shapes and sizes. Ha Long Bai Tu Long Bay to the northeast, and Cat Ba Island to the are Ha Long Bay has an area of around 1,553km2, including 1,960 2,000 islets, most of (4) limestone. The core of the bay has an area of 334km2 with a high density of 775 islets. The limestone in this bay has gone through 500 million years of (5) in different conditions and environments. The evolution of the karst in this bay has taken 20 million years (6) climate. the impact of the tropical wet 1. A. place 2. A. various 3. A. offers 4. A. them 5. A. formation 6. A. in B. destination B. complex B. includes B. those B. foundation B. of C. scenery C. exciting C. consists C. which C. establishment C. for D. landscape D. original D. covers D. whom D. contribution D. under
