Cover of the textbook Focus 4 (2nd edition) - Student's Book

The key answer of exercise 3

The key to exercise solutions in chapter 7.7 - Use of English for the textbook Focus 4 (2nd edition) - Student's Book with authors Sue Kay, Vaughan Jones and Daniel Brawshaw from Pearson Education

Question

Choose the correct option, then answer the questions.

Answer

  1. preceded
  2. historic
  3. Currently
  4. affected; sight
  5. advice

Answers:

  1. To locate submarines.
  2. He made GPS available to all civilian airlines.
  3. Four systems US / Russia / EU / China.
  4. You’d be up to six miles away from your true location.
  5. By measuring the melting of the ice caps.

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