- What is the best way of travelling in a city?. - What is the highest mountain in Viet Nam?. - Travelling by bus is the best way.. - The Great Wall of China is the world’s (long. - Ho Chi Minh City is the (big. - population in the world.. - The Nile River is the (long. - river in the world.. - Fansipan is the (high. - Buri Khalifa in Dubai is the world’s (tall. - Russia is the (big. - country in the world.. - Complete the passage with the words given in the box.. - make noise in the library.. - light fires in the forest Đáp án bài tập tiếng Anh Unit 5 lớp 6 mới I. - light fires in the forest