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)

1.Radioactive pollution is very dangerous because it can cause abnormal growth.

2.Fossil fuels such as coal or oil are burned, so acid gases are produced.

3.Because of the dangerous acid rain, trees' leaves are damaged.

4. Because leaves are damaged so the tree cannot get enough food energy to stay healthy.

4. Because the pilot's sudden strike,all flights had to be cancelled.

=>

1. Radioactive pollution is very dangerous because it can cause abnormal growth.

2. Fossil fuels such as coal or oil are burned, so acid gases are produced.

3. Because of the dangerous acid rain, tree's leaves are damaged.

4. Because leaves are damaged, the tree cannot get enough food energy to stay healthy.

5. Because the pilot's sudden strike, all flights had to be cancelled.