2 cups crushed pretzels, 3/4 cup butter, melted, 3 tablespoons white sugar, 1 (8 ounce) package cream cheese, softened, 1 cup white sugar, 1 (8 ounce) container frozen whipped topping, thawed, 2 (3 ounce) packages strawberry flavored jell-o, 2 cups boiling water, 2 (10 ounce)...