Directions: In this section, you will hear a talk. Answer the questions below. You will hear the recording twice. At the end of the talk there will be a 3-minute pause, during which time you are asked to write down your answers briefly on the Answer Sheet.
Experts say there will be many new threats during the next thirty years. They include climate change, the spread of ______ and animals, uncontrolled expansion of cities and pollution from cars and industry.