----- Nội dung dịch tự động từ ảnh -----
a choose the word a, B, Cor D that best&its eah of the blank spaces.
When man first learned how to make a fire, he began to use fuel for the first
time. The first fuel he used was probably wood. As time (1).. ., man eventually
discovered that substances such as coal and oil (2)... .
Coal (3.. .very widely as a source of energy until the last century. With
the coming of the industrial revolution, it was soon realized that production
(4.. .if coal was used instead of wood. Nowadays, many of the huge factories
and electricity generating stations (5).. .to function if there was no coal.
In the last twenty or thirty years, however, the use of coal (6).. . As a result, there
have been changes in the coal industry. It (7).. .that more people (8). .
coal if oil and gas were not so 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 (9)... . Unfortunately, however, about half of
the world's coal may never be used. Mining much of it (10)..... very expensive
.........
even if it was possible to use new equipment.
1.
A. passes
B. used to pass
C. would pass
D. passed
2.
A. are burning
B. would burn
C. have burnt
D. were burnt
3.
A. not used
B. did not use
C. not using
D. was not used
4.
A. doubles
B. had doubled
C. will double
D. would double
5. A. were unable
B. would be unable
C. will be unable
D. are unable
6.
A. has declined
B. will decline
C. declines
D. would decline
7. A. believed
B. is believing
C. believing
D. is believed
8.
A. would use
B. used
C. use
D. will use