（二）被动语态<?xml:namespace prefix="o" ns="urn:schemas-microsoft-com:office:office"></?xml:namespace>
1. Our efforts willpay off if the results of this research （能应用于新技术的开发）（08.6）
can be applied to the development of newtechnology
2. Many Americans liveon credit, and their quality of life (是用他们能够借到多少来衡量)，not how much they can earn. (07.12)
is measured by how much they can loan
3. Though a skilledworker, (他被公司解雇了) last week because of the economic crisis.(06.6新)
he was fired by the company
（三）定语从句
1. Theprevention and treatment of AIDS is (我们可以合作的领域) （07.6）
The field in which we can cooperate
2.Medical researches are painfully aware that there are many problems_________ (他们至今还没有答案) （08.12）
to which they still have no answers
强化练习
1. which is on the increase.
考点：本题考查非限制性定于从句 which 指代前句话的用法，考生不易想到。
2. as many famous stars who should have appeared did not come.
考点：在英语中表示过去应该做而实际上没有做的事，要用“should + have +过去分词”的句式。