The rocky landscape is part of Dong Van Karst Plateau, the only (1) _______ geological in Vietnam and the second in Southeast Asia, which (2) ______________ recognized by UNESCO since 2010. (3) ________some 1,000 – 1,600 meters above sea level, the plateau lies in Quan Ba, Yen Minh, Dong Van and Meo Vac districts in the northern mountainous province of Ha Giang, covering a total area of nearly 2,400 square kilometers. The geological park features rocky areas that have existed since the Devonian and Permian, the two (4) ____________ period. (5) ________ the center of the rocky terrain from Ha Giang City, tourists have to travel some 200 meters on a winding road. Both sides of the road are forests dotted with a few houses. Some sections of the road are half hidden in the early morning fog. The best time to admire the natural beauty of the rocky plateau is in the morning when the sun shines through canyons and valleys, (6)______ showing sparkling stone. 1. A. nationally B. international C. nation D. internationally 2. A. is B. has been C. had been D. was 3. A. At B. On C. In D. From 4. A. geologist B. geography C. geologic D. geology 5. A. Reached B. To reach C. Reaching D. Reach 6. A. occasion B. occasional C. occasionalist D. occasionally