II. Read the passage and choose the best answer to fill in the blanks. (1p) The world’s population (1)..............five- billion mark in 1987 and it is inreasing (2).............about 1.7 % a year. At this rate of growth, the number of people in the world will double every 41 years. This rapid increase has been called the (3).............explosion. No one knows how many people the Earth can (4).............Many scientists believe that the world will soon become overpopulated, that is, it will have more people than it can support. 1. A. passed B. pass C. past D. passing 2. A. to B. by C. in D. of 3. A. pollution B. polluted C. population D. populated 4. A. be supported B. supports C. supporting D. support