What should be applied between the prefix and the root word in certain cases

Insert comma today we went to the store to the post office and to the park

Which of the following best demonstrate a strong conflict? a. catherine enjoyed painting, and was able to practice her art every tuesday. b. leanne loved camping, but it was a lot of work. she had to start gathering her supplies weeks before the big trip. c. kate wanted to be a fitness instructor. she worked hard to become a certified aerobics teacher. d. russell knew that if he did not get a good grade on his test, then he would fail the class and not be allowed to graduate.

Which of the following is an element of plot