We must keep_______exercise to keep heathly为什么填doing

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• We must keep_______exercise to keep heathly为什么填doing
• 急..英语语法填空1.Deciding what present you should give someone is not easy.Many things must be considered such as _____ the person is interested in and how old he is.?为什么空格处填what 后面有介词in 不是应该用how吗?which呢?请详细解释3者在这里的不行与行的地方,谢谢2.In 1900 the world's use of paper was about one kilogram ____ each person in a year.for和of 在这里的区别,为什么用for?为什么不能用of? 谢谢哦3.We have learnt some of the most important facts of European history from record that ____ (keep) on parchment.我知道填
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• 第一题是:There are some points that you remain ___ about .为什么要填confused而不是confusing?第二题是:There must be no life on the Mars for ___ of air there .为什么要填lack而不是lacked或lacking?然后顺便解释一下keep doing sth 和 keep on doing sth 有什么区别~
• when we are doing the exercise,we must keep our eyes_______ a,close b,closing c,closed d,to close我知道正确答案选c,但是不知道为什么选c?
• We must keep_______exercise to keep heathly为什么填doing
• L___,many people are doing something to make the world abetter place for both humans and animals这是一道首字母填空的题目,填什么?To keep healthy,we must eat ___(health).And we mustn't eat unhealthy food
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