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Exercise 3. Cross out “that”, “who”, “which”, “when” if one can manage without them. Underline the subject in the second sentence.

  1. This is the house that Jack built.

  2. This is the house that stands next to mine.

  3. He only likes people who like him.

  4. He only talks to people who/whom he likes.

  5. He told me an anecdote which I remember for a long time.

  6. The newspaper gives the facts that speak for themselves.

  7. I think Mary is a person who forgets nothing.

  8. Jim is the person that everyone is talking about.

  9. He said he was sorry and the question which he had asked meant nothing bad and that was true.

  10. What’s the time when the bus comes?

REWIEW OF THE CHAPTER III

Exercise 1. Give a brief summary of Texts 2, 3 and 4 using the following words and expressions.

This text deals with …

The four main types of lasers …

It’s known …

Nevertheless …

Therefore …

Just for that …

It’s not by chance …

They are widely used …

Exercise 2. Topics for discussion on the material of Chapter III.

  1. How many stages in maser-laser history can you find?

  2. Who contributed much to the development of masers and lasers?

  3. What other (not mentioned in the texts) uses of lasers do you know?