we have a short break two class空格处填什么介词?

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• we have a short break two class空格处填什么介词?
• 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
• we have a short break two class空格处填什么介词?
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