1. The Water Project digs some wells in Africa. People can have safe and clean water for daily use. (so that).
->The Water Project digs some wells in Africa so that people can have safe and clean water for daily use.
2. The plane started to take off. My older sister nervously held my hands. (when).
-> When the plane started to take off, my older sister nervously held my hands.
3. Rosé missed the beginning of the lecture. She was late for class. (since).
-> Rosé missed the beginning of the lecture since she was late for class.
4. Mr. Allen went to Australia last year. He wanted to do research on kangaroo's habitat. (in order to).
->Mr. Allen went to Australia last year in order to do research on kangaroo's habitat.
5. He has been living in Finland for ten years. He never gets used to the cold. (although).
-> Although he has been living in Finland for ten years, he never gets used to the cold.
6. She had graduated from Yale University. She planned to set up a small business on her own. (after).
->After she had graduated from Yale University, she planned to set up a small business on her own.
7. My father will give us a ride to the shopping mall. He has dropped my mother off at the bakery. (as soon as).
->My father will give us a ride to the shopping mall as soon as he has dropped my mother off at the bakery.
8. Many children in Uganda are forced to work at young ages. Their families are too poor. (because).
->Many children in Uganda are forced to work at young ages because their families are too poor. 
9. She goes to bed. She always says a prayer for her family's good health. (before).
->Before she goes to bed, she always says a prayer for her family's good health.