1. There was aloud noise next to my door last night so I couldn't sleep. (because)

=>I couldn't sleep because there was aloud noise next to my door last night___

3. The acid rain happen last month. Many plants and trees died.(Since)

=>Many plants and trees have died since the acid rained happen last month_

4. There have been conficts in that country since last year. People live unhappily.(If)

=> If There hadn't been conficts in that country since last year,people would have lived happily_________

5. This factory doesn't treat its waste well so there is a lot of water pollution. ( If)

=>If this factory treats its waste well,there won't a lot of water pollution.__