1.Mr wang is at home.→Mr wang is in.
2.The baby sleeps (about ten)hours every night.→How many hours does the baby sleep every night?
3.多吃蔬菜有助于你的身体健康,提高学习效率.→It does good to your health and raising your learning efficiency to eat more vegetables.
4.make sure you have the right shoes→确保穿对鞋子
5.而且当你在水里的时候必须时刻当心.→And you must be careful all the time when you are in the water.