Заполните пропуски модальными глаголами или их эквивалентами (can, must, are to, should, had to, may, could): 1. It is

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