Combine each pair of sentences, using the words/ phrases in the brackets
1. Radioactive pollution is very dangerous. It can cause abnormal growth. (Because)
2. Fossil fuels such as coal or oil are burned. Acid gases are produced. (So)
3. Acid rain is dangerous. Trees, leaves are damaged. (Because of)
4. Leaves are damaged. The tree cannot get enough food energy to stay healthy. (Since)
5. All flights had to be cancelled as a result of the pilot's sudden strike. (Because)
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