Ex1: Choose 1. Too much dioxin in the atmosphere cause global........ a. warm b.warming c. warmly d. warmed 2. Singapore is famous for its.......and green tress a. clearly b. cleaning c. clean d. cleaned 3. ........natural disaster is the most common in our country a. What b. which c. who d. when 4. The heavy rain has caused ........... in many parts of our country a. storms b. floods c. droughts d. volcano 5. The..... buried the whole village while people were sleeping. a. tornado b. drought c. mudslide d. storm Ex2 : Supply the correct word forms 1. Scotland is an interesting place ti visit with its rich ..... CULTRURAL 2. The victims of the .......... village were provided with food and medicine FLOOD 3. Floods, tsunamis, droughts, are examples of ........... disasters NATURE 4. This river will soon become.............if people here keep dumping waste into it POLLUTE Ex3 : 1. By the time we ( get ) ....... to the cinema, the film ( start ).......... 2. Radio waves ( discover )...........by Hein Hertz 3. If trees get enough water and sunlight, they ( grow ) .......... well