Английский язык. Ч.3 (Units 9,10). Ильичева Н.А - 23 стр.

   Einstein’s photoelectric theory satisfied the scientific method by being
experimentally valid. We have a confused situation. Is light a wave or a
particle? The answer to this could be in the term “the dual nature of light”,
which simply means that light acts sometimes like a wave and sometimes like a
particle.
                                  Grammar in use
                         The infinitive and the -ing forms

18. Use the verbs in brackets to supply the appropriate forms of the
     infinitive (the to-infinitive or the bare infinitive).
    1. Refraction makes a pencil put in water … bent (look).
    2. Gas explosions caused the carbon … fire (catch).
    3. A telescope is used … objects that are very far away (magnify).
    4. Large radioactive doses can … mutation in genes (cause).
    5. Radioactive isotopes allow researchers … the flow of blood in biological
      organisms (monitor).
    6. A tornado warning made people … shelter (seek).
    7. We were made … indoor shoes inside the school building (wear).
    8. You’d better … what you think (say).
    9. I’d rather … for a walk in the rain than … nothing at all (go, do).
    10. Let’s … the speed of light in diamond (calculate).
    11. I felt the house … with the explosion (shake).
    12. I heard the door … and saw a shadow … across the floor (open, move).

19. Rewrite the sentences using a to-infinitive instead of that.
    1. People know that she is a very generous woman.
      People know her to be a very generous woman.
    2. I hope that I will succeed. I hope to succeed.
    3. I believe that they are guilty.
    4. I found that he was very lazy.
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