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Here are the completed sentences with similar meanings: 1. Mr Quang works in a noisy environment. His hearing becomes worse if he works in a noisy environment for too long. (Alternative: If Mr Quang works in a noisy environment, his hearing becomes worse.) 2. I can't tell you unless you tell me what's wrong. If you don't tell me what's wrong, I won't be able to tell you anything. 3. Acid rain is dangerous. Trees' leaves are damaged because of acid rain. (Alternative: Acid rain damages trees' leaves.) 4. Fossil fuels such as coal or oil are burned. Acid gases are produced, so we have acid rain. 5. Eating too much sugar can result in health problems. Eating too much sugar will lead to health problems. 6. David had gone home before we arrived. We arrived after David had gone home. 7. We had lunch then we took a look around the shops. We took a look around the shops before having dinner. 8. The light had gone out before we got out of the office. When we got out of the office, the light had already gone out. 9. After she had explained everything clearly, we started our work. By the time she had finished explaining everything clearly, we started our work. 10. My father had watered all the plants in the garden by the time my mother came home. My mother came home before my father had finished watering all the plants in the garden. (Alternative: My father watered all the plants in the garden before my mother came home.)