21. Make these adjectives negative by adding the prefix un– and complete with them the following sentences.

economic	economical	satisfactory	systematic
necessary	scientific	enjoyable	available
suitable	equal	productive	conditional
important	usual	desirable

1. People do not like working in _______ conditions.

2. The employers decided to close that factory because it was ______ .

3. Complete economic freedom is an ______ situation.

4. Compared with our need for food, clothes and shelter, some of our wants are quite _____ .

5. We say that goods are sold at ______ prices, when the price is less than the cost of producing them.

6. The goods which he wanted were ______ at the price which he was willing to pay.

22. Make these adjectives negative by adding the prefix in– and complete with them the following sentences.

active	activity	secure	security
organic	sufficient	definite	adequate
distinct	complete	solvent	expert
frequent	conclusive	dependent

1. Metals are ______ substances.

2. Most nations like to be economically ______ .

3. The services which they provided were quite _____ .

4. If an economy becomes unstable, people begin to feel ______ .

5. The men were rather ______ at the kind of work which they had been asked to do.

23. Make these words negative by adding prefix in– and altering it to suit the consonant which follows (il–; im–; ir–) .

legal	mobile	proper	personal
probable	legible	logical	rational
regular	relevant	responsible	possible
practical

24. Make each word below negative by adding a suitable prefix: non– ; un– ; or in– (or il– ; im– ; ir– as required).

economic active distinct legal systematic public definite dependent secure

industrial practical scientific relevant satisfactory frequent available probable regular

mobile productive legible important logical adequate proper rational suitable

personal enjoyable responsible organic sufficient conditional complete desirable essential

usual stable equal communist solvent conclusive political expert necessary

25. Study the following and write a composition (about 300 words).

Most people work in order to earn their living, and they produce goods and services. This fact can be shown as a diagram:

Most people produce

goods or services

The things which people produce are called their products. So the diagram can be drawn as:

products

goods services

Below are 20 kinds of people. Ten of them produce goods; ten produce services. Use these as examples in your composition.

cattle-breeder pilot shoemaker horse-breeder builder

coal-maker teacher steelworker shopkeeper electrician

musician doctor nurse cook policeman

farmer banker fruit-grower fisherman iron-ore miner