Rewrite the sentences using the word(s) in brackets.
1. I can't come with you. I have to help out at the animal shelter. (as)
2. He stopped driving to work. He wanted use public transport more. (the reason why)
3. She has a car. She can go wherever she wants. (now that)
4. Cars have been banned. The air in the town is cleaner (due to t he fact that)