The disappearance of large animals, such as dinosaurs, _______ scientists' . 2. Many years ago, scientists didn’t ________ the reasons why dinosaurs died out. 3. If the black air _________ the sunlight for several months, plants would die. 4. The development of animals and plants _________ food, weather and other conditions. 5. The asteroid was so huge and it made a big hole which was ________ 200 kilometers across. 6. ________ serious pollutions, the disaster caused earthquakes, acid rain, coldness and lack of food. 7. The natural disaster ________ the death of dinosaurs. 8. I’m very interested in wild animals ______ plants.