UNIT 7 WORLD POPULATIONFOR THEIR HOLIDAY.II. COMPLETE EACH OF THE SENT...

2. If you ______ (smoke) in a non-smoking compartment the other land contains most of its population. A quarter of the population (3) ______ passengers ______ (object).China is in the middle and lower parts of the Yangtze River, and the population density (4) ______ 663 people per square kilometer. Shanghai is China's largest