Заполните пропуски модальными глаголами или их эквивалентами
(can, must, are to, should, had to, may, could):
1. It is he who … decide where and what sound effects and music … be used.
2. The director … be certain that each shot smoothly joins the previous one.
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3. … you imagine life without films or television cinema's little sister?
4. Only one person … watch a kinetoscope at a time.
5. Chaplin’s mother … walk off the stage.
6. Electronic systems … include automatic controls for exposure, focusing,
flash, film winding, and film rewinding.