I. Read the passage. Choose the most suitable word to fill in the blank. Designated a UNESCO World Heritage site (1) _______ 2003, the remarkable Phon
I. Read the passage. Choose the most suitable word to fill in the blank. Designated a UNESCO World Heritage site (1) _______ 2003, the remarkable Phong Nha-Ke Bang National Park contains the oldest mountains in Asia, formed approximately 400 (2) ________ years ago. Riddled with hundreds of cave systems – many of extraordinary scale and … Đọc tiếp