The site is extremely expensive to maintain and it will cost between three and five million yuan to repair it.

　　3．be of＋抽象名词＝be＋adj.

　　They are a precious part of our cultural heritage-it is of vital importance that we do something.

　　 [句式仿写]

　　1．(天津卷)他起床晚了，匆忙去了办公室，留下早餐没有动。

　　He got up late and hurried to his office，leaving__the__breakfast__untouched．

　　2．这台机器很容易操作。任何人在几分钟之内就可以学会。

　　This machine is very easy to__operate. Anybody can learn to use it in a few minutes.

　　3．一些学生认为劳动教育有助于身体健康，使他们全面发展。

　　Some students think labour education will__be__of__benefit for their health, enabling them to be well developed.

　　 remains　n．遗迹；遗体；剩余物

　　[佳句背诵]

　　Svan found the remains of buildings buried under the sand.

　　斯文发现了埋葬在沙子下面的建筑物遗迹。

　　We were told to remain in our seats meanwhile with our seat belts fastened.

　　我们被告知系好安全带留在座位上。

　　[考点对接]--单句语法填空/单句改错

　　①(四川卷)Ladies and gentlemen, please remain seated(seat) until the plane has come to a complete stop.

　　②It remains to__be__seen(see) whether Jim will be fit enough to play in the finals.

　　③(上海卷)The lady said she would buy a gift for her daughter with the remaining(remain) 20 dollars.

　　④Although he has taken a lot of medicine, his health remains poorly.poorly→poor

　　(1)remain vi.　　　　 剩下；停留；留待；依然

　　remain link.­v. 保持；仍然是......(＋adj./n.)

　　remain to be done 某事有待去做

(2)remaining adj. 余下的，剩下的(只作前置定语)