Английский язык. Ч. 1. Ильичева Н.А - 7 стр.

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      C. Fill in the correct word derived from the words in brackets.
      1. Aristotle’s theory of motion prevailed some fifteen centuries after
his………… (die)
      2. Forces may act on an object in……….directions (differ)
      3. If the forces are …………, that is, equal and opposite, motion doesn’t occur.
(balance)
      4. Inertia is the …………to a change in motion (resist)
      5. A reasonable…………is that the greater inertia or mass of an object, the
smaller the change in motion or velocity is when a force is applied. (assume)
      6. It appeared that objects had a …………or a property of maintaining a state
of motion. (behave)

      D. Put in the Present Perfect Continuous or Simple.
      1. We (walk) ten kilometers. We (walk) for three hours.
      2. I (make) sausage rolls for the party all the morning. I (make) 200.
      3. The boy (eat) seven ice-creams today. He (not stop) eating since he arrived.
      4. He (sleep) since ten o’clock. Its time he woke up.
      5. Ann (garden) all afternoon. She (plant) a lot of rose bushes.
      6. He (cough) a lot lately. He ought to give up smoking.
      7. I (polish) this table all the morning and I’m not satisfied with it yet.
      8. I (clean) the car. Doesn’t it look nice?
      9. That pipe (leak) for ages. We must get it mended.
      10. I (pump) up three tyres. Would you like to do the fourth?

      E. Put in the Present Simple or Continuous, the Present Perfect Continu-
ous or Simple.

      1. I (look) for him all day. I can’t find him.
      2. He usually (drink) coffee but today he (drink) tea.
      3. I (know) Lilian for two years.
      4. Someone (knock) at the door. Shall I answer it?
      5. What you (read) now? I (read) Crime and Punishment.
      6. She (be) ill since Monday.
      7. It (rain) for two days now. There will be a flood soon.
      8. He (relax) at weekends.
      9. He (speak) for an hour now. I expect he’ll soon be finished.
      10. Not many passenger planes (fly) faster than sound.

      F. Writing.
      Write a paragraph on one of the following topics.

      1. Newton’s first law of motion. The natural state at motion.
      2. Force, inertia, mass and weight.
      3. Newton’s second law of motion.
      4. Newton’s law of gravitation: explain why any two objects will drop at the
same rate no matter what they weigh, if air friction can be neglected.