【推荐1】It is necessary ________ he should learn about the whole matter. (用适当的词填空)

【推荐2】See to it ________ all the students will know the news. (用适当的词填空)

【推荐3】One of the main reasons for this is ________ teachers work too hard but get too little.（用适当的词填空）

【推荐1】The house ________ stands on the top of the hill was built a few years ago. （用适当的词填空）

【推荐2】Let me show you the novel _____ I borrowed from the library which was newly open to us. (用适当的单词填空)

【推荐3】Just remember that it is completely normal to struggle with the stress________parent-child tensions create, and________you and your parents can work together to improve your relationship.(用适当的词填空)