Insert commas in the following sentences:
1. We can go to the zoo or we can go to the movie theater.
2. They like chocolate but they like vanilla better.
3. We will go to the restaurant now for we are very hungry.
4. I do not like biology nor do I like chemistry.
5. James wants to leave now yet we must wait for his little brother.
6. Terry is working on a project and he should be finished with it next week.