11. You cannot enjoy this merry evening party because you have a

11. You cannot enjoy this merry evening party because you have a 
toothache. I f ...
12. You know the material well enough, but you are veiy absent-minded 
and that’s why you always make many mistakes. I f ... .
13. We shall not go to see them because it is very late. I f ... .
14. Naturally she was angry because you were in her way. I f ... .
15. He always gets top marks in mathematics because it is his favourite 
subject and he works a lot at it. I f . .. .
1 6 .1 did not translate the article yesterday because I had no dictionary. If
17. We lost our way because the night was pitch-dark. I f ... .
18. The box was so heavy that I could not carry it. That’s why I took a taxi. 
I f . . . .
19.1 had a bad headache yesterday, that’s why I did not come to see you. If
20. The ship was sailing near the coast, that’s why it struck a rock. I f . .. .
21. He was not in town, therefore he was not present at our meeting. I f ... .
22. The pavement was so slippery that I fell and hurt my leg. I f ... .
23. They made a fire, and the frightened wolves ran away. I f . . . .
24. It is late, and I have to go home. I f . .. .
25. I was expecting my friend to come, that’s why I could not go to the 
cinema with you. I f ... .
26. The sea rough, and we cannot sail to the island. I f . ...
103

UNIT 1
Read the text
COMPUTER SCIENCE
1. Computer science is a part of an applied mathematics. Specialists in 
computer science say that this field of knowledge is very interesting 
because it deals with computer-aided-design (CAD) and computer-aided- 
manufacturing (CAM).
2. Computers are intended to improve the productivity of labor of 
scientists, designers, engineers, managers, and other specialists, because 
computers offer quick and optimal solutions. One of the main goals of 
using CAD/CAM is to shorten the time between designing and 
manufacturing.
3. Moreover, computers came in our life and to our houses and now we can 
solve our everyday problems with their help.
4. Computers can be divided into simple and complex devices. Simple 
computers such as calculators can perform addition, subtraction, 
multiplication and division. As far as complex computers are concerned 
they can do different logical operations and some of them even have 
artificial intelligence.
5. Thus in order to elaborate up-to-date and inexpensive programs as well 
as to defend them from viruses, it is important to know some programming 
languages.
6. There are low- level programming languages such as a machine 
language and an assembly language and an high-level programming 
languages, for instance, FORTRAN, PASCAL, ADA, C, BASIC, etc

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