1) There are many keys here. Which  ... are yours ? a) one b) ones 2) How old are your children? The younger ...  is six and the older is nine. a) one b) ones 3) New computers are much smaller than the old ... . a) one b) ones 4) My bag is so old. I need a new ... . a) one b) ones 5) Big plums are usually sweeter than small ... . a) one b) ones 6) I need new shoes. My old ... are very old. a) one b) ones 7) When you buy two shirts, you get a third ... free. a) one b) ones

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