III. Read the following passage. Choose the best answer, then do the task below: 
When the man first learns how to make a fire, he began to use fuel for the first time. The first fuel he used was probably wood. As time passed man eventually discovered that substances such as coal and oil (1) __________. 
Coal (2) _________ very widely as a source of energy until the end of the 19th century. With the coming of the industrial revolution, it was soon realized that production (3) _________if coal was used instead of wood. Nowadays, many of the huge factories and electricity generating stations (4) _________   to function if there was no coal. 
In the last forty or fifty years, however, the use of coal (5) _________ as a result, there have been changes in the coal industry. It (6) _________ that more people (7) _________ coal if oil and gas were not readily available. 
There is more than enough coal in the world for man’s needs for the next two hundred years if our use of coal (8) _________ Unfortunately, however, about half of the world’s coal (9) _________ Mining much of it (10) _________ very expensive even if it was possible to use new equipment. 
1.  A- are burning    B- would burn    C- have burn    D- were burnt  
2.  A- nit used     B- did not use    C- not using    D- was not used  
3.  A- doubles     B- had doubled   C- will double    D- would double  
4.  A- were unable    B- would be unable  C- will be unable   D- are unable  
5.  A- has declined   B- will decline    C- declines    D- would decline  
6.  A- believed    B- is believing    C- believing    D- is believed  
7.  A- would use    B- used    C- use     D- will use  
8.  A- did not increase     B- would not increase  
C- does not increase   D- may not increase  
9.  A- would never use    B- may never be used               
C- may never use                D- would never be used  
10.  A- was    B- used to be    C- would be    D- has been  
      * Are the following statements true (T) or false (F)? 
  1. As time passed, man eventually discovered that the wood would burn. 
  2. With the coming of the industrial revolution, the production would minimize if coal was used  
        instead of wood. 
  3. In the last twenty years there have been changes in the coal industry. 
  4. If oil and gas were not so readily available, fewer people would use coal.