1.Because There was a loud noise next to my door last night, I couldn't sleep.

2.The tsunami made many people in this area homeless.

3.Many plants and trees died since the acid rain happened last month.
4.If there were no conflicts in that country, people would live more happily.
5.If this factory treated its waste well, there would be less water pollution.

1.Because there was a loud noise next to my door last night, I couldn't sleep

2.The tsunami made many people in this area became homeless

3.Since the acid rain happened last month, many plants and trees died(since=because)

4.If there hadn't been conflicts in that country since last year, people would live unhappily

5.If this fatory treat waste, there won't be a lot of water pollution