Mr and Mrs Smith have two sons and two daughters. They're Tom,Jack,Sally and Mary. They're quadruplets(四胞胎), so their birthday is on the same day—July 22nd.

    It's their fourteenth birthday today. Their parents buy some things for them:four cakes, two T-shirts and two skirts. The four cakes are the same, and one cake is 15 dollars. The two T-shirts are the same,too. They are yellow and 35 dollars for one. The price of the two skirts is the same and one skirt is 60 dollars. But their colors are not the same. Sally likes blue and Mary likes green, so the blue skirt is for Sally and the green one is for Mary.