1.we/keep/our bodies/warm/ avoid/flu /a cold.
✏We should keep our bodies warm to avoid flu and a cold.
2you/not/play/more/computer games/free time
✏You shouldn't play more computer games in your free time.
3.vitamins/play/important/role/our diet
✏Vitamin plays an important role in our diet
4.getting/enough/rest/help/you/concentrate/school
✏ Getting enough rest helps you concentrate after school