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3. Read the dialogue and learn how to speak about your past activities. Put the verb in brackets into the Past Continuous. Pay attention to the terms of electricity.

Peter: Hi, Paul. Glad to see you.

Paul: So am I. Peter, can you tell me what you (to do) yesterday from 9 till 11 a.m.? I (to look for) you.

Peter: Well, let me see. A few students and I (to carry out) some experiments with different electrical devices. As for me, I (to measure) the voltage.

Paul: And what about Alex? Do you happen to know what he (to do)?

Peter: As far as I remember, he (to measure) the resistance of a lead.

Paul: Oh, I see. I hope Michael (to help) him.

Peter: Yes, he was. He (to connect) leads to the multimeter. The needle (to indicate) the value of the resistance on the scale.

4. Put in the missing words, using the words from the table above:

    1. Last year we were solving the problem of how to dispose of … waste.

    2. Plants … oxygen.

    3. The energetic flow circulates in harmony with the rhythm of its … .

    4. Silicon is the material of which most semiconductors are … .

    5. Darker surfaces … heat.

    6. … passes quickly through materials such as metals.

    7. Elements with … properties are placed in the same vertical column.

    8. Some elements are created by atomic physicists using special … .

    9. In the crystal … each atom employs its four valence electrons to form covalent … with four neighbouring atoms.

    10. In its solid … silicon forms crystals of the diamond type.

5. Put all possible questions to the following statements.

For example:  Alex was working in the lab from 5 till 7 yesterday.

  • Was Alex working in the lab from 5 till 7 yesterday?

  • What was Alex doing in the lab from 5 till 7 yesterday?

  • Where was Alex working from 5 till 7 yesterday?

  • Who was working in the lab from 5 till 7 yesterday?

    1. I was measuring the value of the resistor from 2 till 3 yesterday.

    2. Peter was connecting the leads to the resistor at that moment.

    3. The students were investigating superconductors at 10.30.

    4. We were carrying out the experiment in the lab during several hours.

    5. The professor was checking our tests all day long.

6. Put the verb in brackets into the Past Continuous.

  1. Paul (to test) a new device from 11 till 12 yesterday.

  2. The students of the Technical University (to carry out) an experiment with a multimeter in the lab last week.

  3. I (to measure) the voltage during our class.

  4. Alex (to write) a report on the latest achievements in electricity at 7 o’clock yesterday.

  5. Last year we (to solve) the problem of how to dispose of radiated waste.

  6. The American physicist Robert A. Millikan (to observe) one drop after another, varying the voltage and noting the effect.

  7. When Ernest Rutherford (to experiment) with radioactivity at the University of Manchester in 1911, atoms were generally believed to consist of large mushy blobs of positive electrical charge.

  8. Physicists in Japan (to convert) an electrical current into a spin signal and then back again.