1 He was prepared to prove his theory that two different weights would fall to the ground at the same time.
这里的先行词是his theory，同位语从句是that two different weights would fall to the ground at the same time。
2 The fact that he succeeded in the experiment pleased everybody.
这里的先行词是the fact，同位语从句是that he succeeded in the experiment。
3 The rumor that Tom was a thief turned out to be untrue.
这里的先行词是the rumor，同位语从句是that Tom was a thief。
4 They spread the lie everywhere that Tom was guilty of theft.
这里的先行词the lie与同位语从句that Tom was guilty of theft被everywhere隔开。
5 A saying goes that practice makes perfect.
这里的先行词a saying与同位语从句that practice makes perfect被谓语goes隔开。
6 Dreary months dragged by before the tragic news reached her that her beloved brother had been killed for anti-Nazi activities.
这里的先行词the tragic news与同位语从句that her beloved brother had been killed for anti-Nazi activities被谓语reached her隔开。
They are faced with the problem whether they should continue to work. 他们面临这样一个问题：他们是否应该继续工作。
1 There arose the question where we could get the loan. 现在的问题是我们去哪里弄到这笔贷款。
2 The question who should go abroad on this business tour requires consideration.
3 I have no idea when he will return. 我不知道他什么时候回来。
1．No one knows exactly______.
A．how did speech begin
B．how speech began
C．how the beginning of speech
D．of how beginning speech
2．It is obvious______on more important things.
A．which the money should we spend
B．what the money should we spend
C．that the money should we spend
D．that we should spend the money
3．_______hard water does not mix well with soap.
A．That is a well-known fact
B．That is a well-known fact in which
C．It is a well-known fact that
D．It is a well-known that
4．________every magnet is surrounded by a magnetic field.
A．It believes that
B．It believed that
C．It is believed that
D．It's believing that
5．________was to return to school.
A．That really interested him
B．What really interested him
C．Which really interested him
D．That interested him really
6．Stopping pouring polluted water into the river is_______the factory has to solve at present.
7．____the mass of the nucleus is slightly less than the total mass of the protons and neutrons which made up the nucleus.
A．It found that
B．It was found that
C．It was found for
D．It finds that
A．what will be his wife's reaction
B．what would his wife's reaction be
C．how would be his wife's reaction
D．what his wife's reaction would be
9．He asked me_______I intended to do after my graduation.
10．Listening carefully to_____in class means less work later.
A．what does the teacher say
B．what the teacher says
C．that the teacher says
D．which the teacher says
11．After the accident, I opened my eyes slowly and realized_______I was still alive.
12．John didn't say_______he would return, but I presume he'll be back for dinner.
C．if or not
13．He works too hard. That is_______is wrong with him.
D．the thing what
14．________to space travelers is high acceleration or deceleration forces.
A．Danger can be
B．What can be dangerous
C．They can be dangerous
15．According to some educators, the goal of teaching is to help students learn what_______to know to live a well-adjusted and successful life.
A．do they need
C．they are needed
D．as they may need
16．_________the trainer wanted to tell is_________Asian elephants are easier to tame than African ones.
17．________the London Zoo will adopt as a measurement at the critical moment is to try all ways preserving the animals in the zoo.
18．The problem now is_______we can adopt to overcome the difficulties in shortage of funds.
19．The mountain was________many animals, such as wolves, badges and rabbits once haunted but now it is so silent.
20．The reason we're so late is_______.
A．because of the car breaking down
B．due the care broke down
C．that the car broke down
D．because the car broke down
21．The question is_______can be put into practice.
A．how you have learned
B．how that you have learned
C．that why you have learned
D．how what you have learned
22．There are signs_______restaurants are becoming more popular with families.
23．______that the first cheese was probably made more than 4,000 years ago by nomadic tribes in Asia.
B．Although they believe
C．It is believed
24．In the fourteenth century, ________that glass coated with silver nitrate would turn yellow when fired in an oven.
B．it was discovered
C．with the discovery
D．if it was discovered
25．We were all overjoyed at the news_________the experiment turned out a success.
26．A hinge joint is______(what/that/which) permits the forward and backward movement of a door.
27．It's doubtful________(whether/that/how/what) the government of that country can accept them as permanent residents.
28．It has always puzzled me________(that/why/where/what) the old man tied a red silk ribbon on the young tree in his courtyard.
29．The reason for my return is_______(because/it/that/why) I left my keys behind.
30．Scientists have reached the conclusion________(what/that/which/when) the temperature on Earth is getting higher and higher.
31．I have no idea________(what/that/which/why) has happened to him.
32．An idea came to her________(that/what/when/which) she might do the experiment in another way.
33．One of the qualities________(that/what/who/why) separate us two-legged animals from the four-legged ones is compassion. It is_______(which/that/what) makes us stand up tall instead of crawling about on all fours. And standing up tall is________(which/that/what) frees our arms to reach out to a fellow being and say, "Let me help you."
34．Change is________(which/that/what) keeps us fresh and innovative. Change is________(which/that/what) keeps us from getting stale. Change is________(which/that/what) keeps us young.
35．Is there (A) any proof (B) which the food of the plant (C) differs from (D) that of animals?
36．A man cannot be really happy if (A) that he enjoys doing (B) is ignored by society (C) as of no value or (D) importance.
37．More and more people (A) have realized (B) such a fact (C) of heart diseases (D) are related to the way people live.