Trang An is a famous tourist complex located in Ninh Binh province in the north of Vietnam. It is important national heritage and has been a UNESCO World Heritage site on 23 June 2014. Among the diverse ecosystems, forests and limestone mountains (1)__________ with the history of the ancient capital of Hoa Lu, Trang An Grottoes are Vietnamese most spectacular sights. The scenery here is just (2)__________. Trang An Grottoes are a gathering of 31 valleys, 50 cross water caves, and home to 600 kinds of flora and over 200 kinds of fauna, many of (3)__________ are in the Red Book of Vietnam. While rowing through Trang An grottoes in the quiet, fresh air of the highlands, with only the sound of birds and the oars stirring the clear water, you will (4)__________ that you are in a paradise on earth. Many foreign tourists say that Trang An is truly a great wonder of Vietnam.

1. A. associated B. linked C. contacted                           D. joined
2. A. incredible B. artificial C. unreal                                 D. untrue
3. A. them B. which C. what                                   D. that
4. A. know B. understand C. consider                              D. see