Exploring Writing 2nd Edition by John Langan

Exercise 109

Place a comma before a joining word that connects two complete thoughts (two subjects and two verbs). Remember, do not place a comma within a sentence that has only one subject and a double verb. (Some items may be correct as given.)
1. Armand left work early to pick up his daughter from school and take her to basketball practice.
2. You can spend hours circling the parking lot looking for a spot near the store or you can easily park a few yards away and get some exercise.
3. Our professor told us that the quiz would cover material we learned since the last exam but the quiz also covered material that we learned before the exam.
4. Kristine was worried that she would lose her sales job so she began taking accounting classes at the local community college.
5. Only a few people attended the game but that did not discourage the players from playing to their upmost and winning the division title.
6. I used last night's leftovers to make a delicious chicken salad sandwich for lunch and prepare a chicken casserole for the freezer.
7. I made an appointment with a personal financial advisor for I need to start planning for retirement.
8. Lance promised that he would teach me how to play Texas Hold'em and I promised that I would help him with his math homework.
9. Claire was worried about her father's health so she made an appointment for him with a doctor at the community clinic.
10. The customer tried on dozens of outfits but walked out of the store without purchasing a single item.