Which sentence shows the correct use of a comma in direct address? a) are you going to the beach this weekend walt? b) lincoln, our 16th president, was assassinated on april 14, 1865. c) denise, could you call me tonight to discuss our biology project? d) our team for the golf tournament is matthew, david, john, and alex.

Walking is not the most exciting form of exercise a person can take on for fitness. yet it is low impact and requires no fancy equipment. that makes walking a simple activity for those new to exercise. walking is less likely than other exercises to cause injury to leg tendons and muscles. all it requires is a good pair of sneakers-no cables, stylish outfits, or weights required. of course, a person could increase the benefit of a workout by adding weights or speed walking. identify the main idea of this paragraph. walking is a difficult and safe exercise for beginners. walking is an easy and safe exercise for beginners. walking is a boring and dangerous form of exercise. walking is an exciting and very effective form of exercise.