Combine each pair of sentences, using the words / phrases in brackets. Don't change the given words / phrases. 98 Radioactive pollution is very dangerous. It can cause abnormal growth. (since) 99 The area is uninhabitable. The Chernobyl nuclear accident happened. (made) 100 Fossil fuels such as coal or oil are burned. Acid gases are produced. (so) 101 Acid rain is dangerous. Trees’ leaves are damaged. (because of) 102 Leaves are damaged. The tree cannot get enough food energy to stay healthy. (because)