VI. Read the text. Choose the right words and write them on the lines. Thousands of years ....ago...., people didn’t stay in the same place because they had to travel (1) ....................find food. They lived in caves or slept in tents (2) ....................were made from animal fur. They cooked their food on fires that also kept them warm (3) .................. the long, cold and wet winters. Fire kept people safe too (4) ......................wild animals are afraid of fire. Our homes (5) ....................changed a lot! Most people now live in warm, dry and safe buildings. In some big cities you can find new buildings that might have more (6) ................ a hundred floors. These are called skyscrapers. Some skyscarpers have garden on (7) ..................... roofs. You can make a “green roof” by planting different kinds (8) ...............grass there. On some city buildings, you can also see “green walls”. In big cities, (9) ...................green roofs and walls is a really good idea. The leaves on the plants help clean the air and make our environment much (10) ..................... Example: since for ago 1. for to with 6. when than if 2. which what who 7. theirs its their 3. during past until 8. off from of 4. so because before 9. making made makes 5. have are do 10. better good best