根据短文内容，用所给词的适当形式填空。（其中有两个词多余）

play;lazy; too; time;always;go;thin; try; health; could; either; can;

 
How can we keep _______?One important thing is to exercise often.The Smith family try to exercise every day.Qiang Smith_________ not exercise in the morning because he must be at his job at seven o'clock.But he runs every evening.He walks a lot, _________.He walks to school every day and after school he _______ basketball with his friends.Qiang goes to a yoga (瑜伽)class three __________ a week,but it isn’t _______this way. Last year Mr.And Mrs.Smith___   ___ everywhere by car.They thought they should use the car all the time.Now the Smiths walk more,and they all think they feel better ..Mrs Smith thinks she is ________ than before.And they think they mustn't be too __________.They don't have to exercise every day,but they should__________ to keep in good health.