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Exercise 11. Match the verbs with their definitions



  to announce a to produce or design sth that has not existed before
  to award b to become or to make sth greater in amount, number, value, etc.
  to demonstrate c to make an official decision to give sth to sb as a payment, prize, etc.
  to discover d to need sth; to depend on sb / sth
  to increase e to get or accept sth that is sent or given to you
  to invent f to be the first person to become aware that a particular place or thing exists
  to propose g to tell people sth officially, especially about a decision, plans, etc.
  to receive h to suggest a plan, an idea, etc. for people to think about and decide on
  to repair i to show sth clearly by giving proof or evidence
  to require j to restore sth that is broken, damaged or torn to good condition

Exercise 12. Compare these two similar sentences. Which one is true?

1. Ali Javan invented the first laser using a pink ruby medium. 1. Physicist Mainman invented the first laser using a pink ruby medium.
2. The first gas laser used helium and neon as the light emitting material. 2. The first gas laser used helium as the light emitting material.
3. The first semiconductor junction laser was demonstrated almost simultaneously by two companies. 3. The first semiconductor junction laser was demonstrated by IBM corporation.
4. Experiments requiring high intensities in narrow spectral regions can be made as well with lasers as with conventional light sources. 4. Experiments requiring high intensities in narrow spectral regions can only be made with lasers.




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