WHAT'S THIS?, HELMET, KNEE PADS, GLOVES, WHAT'S THIS?, GOGGLES, KNEE PADS, HELMET, WHICH ONE?, HELMET, ELBOW PADS, GLOVES, WHICH ONE?, KNEE PADS, HELMET, GOGGLES, WHICH ONE?, DRINK WATER, DRINK TEA, USE SUN CREAM, WHICH ONE?, RIDE A BIKE, GO SKATING, WHICH ONE?, PLAY BASKETBALL, PLAY FOOTBALL, WHICH ONE?, SKATING, SWIMMING, You _______ drink water when you do exercise., must, mustn't, You _______ put on sun cream when you go outside., mustn't, must

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