1 1/2 cups all-purpose flour
1 cup white sugar
1/4 cup cocoa
1 teaspoon baking soda
1/2 teaspoon salt
1 cup water
1/4 cup vegetable oil
1 tablespoon distilled white vinegar
1 tablespoon vanilla extract
2 cups frozen whipped topping, thawed
1 cup sliced fresh strawberries