B. 6. Translate the sentences with Participle I

1. The smallest particle having all the characteristics of an element is called an atom. 2. The changes affecting the composition of matter are chemical changes. 3. Buses are replacing the trams in cities. 4. During the experiment the temperature was changing gradually. 5. Measurements of solar radiation reaching the Earth each day make it possible to calculate the surface temperature of the Sun. 6. While absorbing the energy of cosmic rays the upper atmosphere becomes radioactive. 7. While bombarding the upper layers of the atmosphere, cosmic rays reach the surface of the earth.

B. 7. Translate the sentences with predicates in Perfect Tenses

1. This narrow bridge has been used for many years. Now it needs widening. 2. The road had been paved by the end of the summer. 3. The greatest part of the research has been completed. 4. The population of this country has grown considerably in recent years. 5. We have recently received instruments of high quality. 6. The research has been carried out by the engineers of the plant. 7. The electronic computer has been a remarkable achievement of modern science. 8. The research has been done with the help of electronic machines. 9. The students have done mathematical calculations and now they are drawing diagrams.