Change into the passive structures ​1. the teacher had to explain the difficult rule twice.2 they don't grow fruits in this part of the country.3 they are performing a new piece of jazz.4 they have designed new scenery for the play.5 the actor was ready for the scene as the assistants had made him up.6 they laughed at her because of her funny hat.7 the producer sent for leading actress to start the rehearsal.8 they speak a lot about the new ballet

On the southern slope of the Main Caucasian ridge often jackals and wolves. The ungulates are Caucasian red deer, chamois, ROE deer, wild boar, bison, tour, is out of the reserve will not be met, since the use of grasslands for grazing deprives his natural expansion. The tour is endemic to the Caucasus, the most numerous among ungulates in the reserve, which originally bore the name "bison", as well as their education must first of all these unique animals. Caucasian bison differ from Belovezhskaya characteristic curve of the horns and curly ВАВ.

1. Mixed economy is an economic system in which some industries (are owned) by the state and others (are owned) by private persons and firms.
2. When supply is increased, a larger amount (is offered) at a given price.
3. The supply of agricultural products cannot be (increased) within a very short period of time.
4. The aim of the Organization of Petroleum (Exporting) Countries (OPEC) (founded) in 1961 is to maintain a standard price for oil and, if necessary, to limit output. In 1973 the OPEC suddenly (began) to use its influence (raising) the world price of oil so that by the end of 1974 the price (had risen) three times in most (importing) countries. It (has increased) many times since then.
5. Marginal revenue is the additional revenue (earned) by a producer from selling one more unit of his product.
6. Money supply is the total amount of money (held) by all persons and organizations in a country at a particular time.
7. The revenue (obtained) from selling output depends on the demand.
8. Landless farmers, that is, farmers (owning) no land, have to cultivate land (owned) by others.
9. Economists use the word «capital» for goods not entirely (used) up in the production process, during a particular period. Electricity is not «capital» as it (is used) entirely in the production process.
10. With less risk of a fall of price between the time decisions (are made) and commodities (are sold), producers will use additional inputs.
11. Supply (depends) on output prices and input prices. An increase in the price of an input (results) in a reduced use of that input. A reduction in the price of an output (has) the same effect as an increase in the price of input, that is, a reduced use of input. The input use (won't change), provided output and input prices (rise) or (fall) by an equal percentage. Thus, the effect on output of a decrease in product prices (can be neutralized) by an equal percentage decrease in input prices. Sometimes the prices of inputs and outputs (change) together. For example, a fall of livestock product prices (reduces) the demand for feed grains. This (leads) to a fall in the price of feeds, that is, the price of inputs.