Change the form of the personal pronouns given in brackets

For example: Physicists should work in order to realize (they) ambitions. - Physicists should work in order to realize their ambitions.

1. Today we shall speak about classifying materials according to (they) electrical properties.

2. There are many ways of classifying (they).

3. The one we shall speak about is based on (it) ability to conduct electricity.

4. Do only electrons take part in (it)?

5. Сonductivity is the result of the motion of (they).

6. It is directly proportional to the number of (they) inside the material that can be set in motion.

7. There are materials which have very few of (they).

8. Materials are classified according to (they) properties.

9. Many of (they) were discussed in the lab.

10. (It) number is not relevant.

11. The scientist (he) proved the results to be correct. He didn’t need help of any other staff.

12. (We) results in accomplishing this project were phenomenal.

13. These experiments were (they).

Make up sentences with personal pronouns on the topic of electronics and physics.

SPECIALIST READING

Read the text “Classifying Materials” and fill in the table.

Phenomenon	Definition
Conductivity
Conductor
Semiconductor
Insulator

There are many ways of classifying materials. The one we shall use here is based on the ability of a material to conduct electricity. It is known that conduction takes place as a result of the motion of charged particles, usually electrons. The ability of any material to conduct electricity is directly proportional to the number of charged particles inside the material that canbeset in motion. Materials (for example metals) that have relatively large numbers of free electrons readily conduct electric current and are called conductors. Other materials having very few (or no) free electrons do not readily conduct electric current under normal conditions and are called insulators. Such materials as selenium, silicon and germanium have more free electrons than insulators, but fewer than conductors. They are called semiconductors. Conductivity depends on temperature. In metals the higher the temperature, the lower the conductivity. But in semiconductors, if the temperature rises, the conductivity increases but within certain limits. It should be realized¹ that the terms “conductor” and “insulator” are not absolute, that is² some conductors do not conduct as well as other conductors, while some insulators do not insulate as well as other insulators.

¹ it should be realized – следует учесть ² that is – то есть