unit 3 第三课时 learning about language ⅰ.完成句子a 1．a new teaching building________ ________ ________ ________(已经被建造)in our school. 2．professor james will give us a lecture, but when and where________ ________ ________(还没有确定)． 3．although the causes of cancer______ ________ ________(已经被揭示), we don't yet have any practical ways to prevent it. 4．the students________ ________ ________(已经被告诉)to look after their desks and chairs. 5．every possible means________ ________ ________(已经被尝试)by the company to bring down the wholesale price of its products. 答案：1.has, been, set, up 2.hasn't, been, decided 3.have, been, uncovered 4.have, been, told 5.has, been, tried ⅱ.句型转换 1．the storm has caused millions of pounds' worth of damage.
