高一英語（定語從句）高手進(jìn)~
用正確的介詞+關(guān)系代詞填空
1,As is known to us all,the age_____ _____children can go to school is 7.
2,Mrs Zhang often tells us that spring is the time_____ _____people often go sightseeing.
3,He borrowed a book the other day,the author_____ _____is a worker.
4,Thank you for you help,_____ _____we could not have finished the work on time.
5,Do you remember the building_____ _____flew a fed flag all the year round?
6,The reason_____ _____I bought the roses is that Mary likes them.
7,He built a telescope_____ _____he could study the skies in hie free time.
哪位會(huì)這些題啊?請(qǐng)把答案和用法簡單寫一下.好的可以追加分?jǐn)?shù).謝謝.