Choose the correct answers to complete the passage.

      Ha Long Bay is a UNESCO World Heritage Site and popular travel (1)              in QuangNinh Province, Vietnam. The bay features thousands of limestone karsts and islesin (2)              shapes and sizes. Ha Long Bay is a center of a larger zone which (3)                     BaiTu Long Bay to the northeast, and Cat Ba Island to the southwest.

      Ha Long Bay has an area of around 1,553km2, including 1,960 - 2,000 islets, most of (4)          are limestone. The core of the bay has an area of 334km2 with a high density of775 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 taken20 million years (6)            the impact of the tropical wet climate. The geo-diversity of the environment in the area has created (7)                   , including a tropical evergreen biosystem, oceanic and sea shore biosystem. Ha Long Bay is (8)                        to 14 endemic floral species and 60 endemic faunal species.

      1. a. situation            b. destination            c. direction                d. ground

      2. a. various              b. complex                 c. exciting                  d. original

      3. a. offers                 b. includes                 c. consists                  d. covers

      4. a. them                   b. those                      c. which                     d. whom

      5. a. formation          b. foundation            c. establishment        d. contribution

      6. a. in                        b. of                            c. for                           d. under

      7. a. biochemical      b. biodiversity          c. bioconversion       d. biodefense

      8. a. way                    b. place                      c. home                      d. house