1. Mr Quang works in a noisy environment. His hearing becomes worse.(if) - ………………………………………………………………………………………………. 2. Acid rain is dangerous. Trees’ leaves are damage. ( because of ) - ……………………………………………………………………………………………… . 3. Fossil fuels such as coal or oil are burned. Acid gases are produced. (so) - ……………………………………………………………………………………………….. 4. Eating too much sugar can result in health problem. (lead to) -............................................................ . 5. David had gone home before we arrived. - After …………………………………………………………………………………… 6. We had lunch then we took a look around the shops. - Before …………………………………………………………………………………… VI. Change these sentences into passive voice. 1.The company will give him some money when he retires - When he retires, he ………………………………………………………. 2. They took it back to the zoo. - It …………………………………………………………………………… 3. Someone picks the fruits everyday. - Fruits……………………………………………………………………….. 4. Does the girl do the housework? - ………………………………………………………………………………? 5. They don't drive out the cattle to the field in the winter. - The cattle……………………………………………………………………. giúp iêm vs ặ