Ⅰ.单项填空
1.________ the universe began with the “big bang” has been widely accepted.
A.Whether B.Why
C.That D.What
答案：C 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，故选C。
2.It has been proved ________ having a balanced diet helps to keep healthy.
A.if B.because
C.when D.that
答案：D 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，故选D。
3.________ we'll go camping tomorrow depends on the weather.
A.If B.Whether
C.That D.Where
答案：B 由depends on the weather可知，此处应为“是否”之意，应用if或whether，而主语从句置于句首时只能用whether。故选B。
4.(2014·莱阳高一检测)________ is a fact that English is being accepted as an international language.
A.There B.This
C.That D.It
答案：D 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.
A.What; because B.What; that
C.That; what D.That; because
答案：B 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。故选B。
6.It worried him a bit ________ his memory was becoming worse.
A.while B.that
C.if D.what
答案：B 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.(2014·九江高一检测)________ their flight will arrive on time is ________ they are concerned about.
A.Whether; what B.Whether; that
C.When; what D.How; that
答案：A 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.
A.That B.What
C.Who D.Which
答案：B 主语从句缺少主语要用what引导。
9.When and why he came here ________ yet.
A.is not known B.are not known
C.has not known D.have not been known
答案：A 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，故选A。
10.He left home several days ago. ________ worries many people and is to be found out.
A.Where he has gone
B.Where did he go
C.Which place has he gone
D.Where has he gone
答案：A 考查从句的语序。这是一个主语从句，需使用陈述句语序。故选A。
