unit 4 第二课时
ⅰ.语法填空
1．________ the universe began with the “big bang” has been widely accepted.
答案：that 句意：宇宙开始于“大爆炸”已被广泛接受。从句中意义完整，只需要引导词。
2．it has been proved ________ having a balanced diet helps to keep healthy.
答案：that 句意：据证明拥有一个均衡的饮食有助于保持健康。it为形式主语，后面从句为真正的主语，且从句意义完整。
3．(2015•
北京，35改编)________we understand things has a lot to do with what we feel.
答案：how 句意：我们理解事情的方式与我们的感受有很大关系。由句意可知，填how，意为“如何，怎样。”
4．________ is a fact that english is being accepted as an international language.
答案：it 句意：英语正被接受成为国际性语言是一个事实。此处用it作形式主语，that从句为真正的主语。
5．________ made the parents proud was ________ their son had been admitted to a key university.
答案：what; that 第一个空用what引导主语从句，what在该从句中充当主语；was后为表语从句，该从句中不缺少任何成分，故用that引导，且不可省略。
6．it worried him a bit ________ his memory was becoming worse.
答案：that it为形式主语，真正的主语从句中不缺少任何成分，故用that引导主语从句，且不可省略。
7．________ their flight will arrive on time is ________ they are concerned about.
答案：whether; what 根据语境，主语从句应用whether引导，表示未定的事；what引导表语从句，在从句中作are concerned about的宾语。
8．________ makes the book so extraordinary is the creative imagination of the writer.
答案：what 主语从句缺少主语要用what引导。
9．when and why he came here ________not known yet.
答案：is 句意：他什么时候以及为什么来这儿还不知道。when and why引导的从句作主语，谓语动词用单数，且不被知道。
10．he left home several days ago. ________he has gone worries many people and is to be found out.
答案：where 考查从句的连接词。这是一个主语从句，由句意可知，填where。
11．steve jobs has gone but ______ he has left behind is truly extraordinary.
答案：what 分析句子结构可知，“________he has left behind”是主语从句，且关系代词在从句中作宾语，故选what。
