You (should or must)?make sure you drink plenty of water everyday.是否是should?

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• You (should or must)?make sure you drink plenty of water everyday.是否是should?
• You (should or must)?make sure you drink plenty of water everyday.是否是should?
• Every person has two sets of teeth.The first set of twenty begins to grow when you are over six months old.The second set of thirty-two grows from the age of six until you are about twenty-one years old.To help your teeth grow strong,you must drink plenty of milk and eat greens.You should brush your teeth after each meal.Then few bits of food will be left on or between them to cause decay（腐烂.) Make sure that you turn the brush and go up and down as we
• 用could,need,can't,may,must填空1.Jane isn't in the school,I think she ________be ill.2.The key ________ be Kangkang's,his is in the lock.3.You________wash your hands before meals.4.You _______to drink plenty of water.5._________you help me?What should I do?I don't know.
• the bus is so（c )and there is no seat for me.
• Thanks for ( ) us (teach)