Decide whether eah sentence below is punctuated correctly. if the sentence needs additional commas, indicate where the commas should be placed. did you see the movie that i saw yesterday? the sweater that i left at school was a gift from my mother. we should not buy grapes which scientists say are poisonous to dogs.

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.