请老师回答,填适当的单词The boy has been missing for three days.Everyone

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请老师回答,
填适当的单词The boy has been missing for three days.Everyone is worring about his_______(答案填的是safety,我填的是health,不知道根据句意或语法行不行?如果非要填safety,
填适当的单词Boys and girs behave______,because they have different behaviors.(为什么填differently,是根据句意吗?填differently,
用所给词适当形式填空More and more teenagers go abroad for_______visits in summer holidays(education),为什么还有意思

第一题：那个男孩已经消失三天了,每个人都担心他的安全.不能说担心他的健康,与题意不符.
第二题：男孩和女孩有不同的举止,因为他们有不同的行为表现.副词differently修饰动词behave.
第三题：More and more teenagers go abroad for education.后面是不是出错了

请老师回答,填适当的单词The boy has been missing for three days.Everyone 求翻译has he not for the last three days been trying to creep u The girl has been away from home for three days.同义句 The boy ______(be)ill for three days my watch has been going for three days and it has got run do Tom has been ill for three days.改为否定句,一般疑问句和被动语态 he has been in my hometown for three days同义句 The boy has learned English for about three years的同义句是什么 the little boy has been gone for ages, It has been rained for 2 days.是不是对的? It has snowed for three days running. The wheat___cut three days ago.A.was B.were C.has been D.hav