ответить на вопросы письменно, разумеется по-: 1)what are the biggest film corporations in the usa? 2)what was the first film demonstrated to the audience about& 3) what was the name of the first theatre in london& 4) what categories are there in the mpaa rating system& 5) what genres of films were the first ones shot in america?

1 The biggest film corporations in the USA are Columbia Pictures, Paramount, 20th Century Fox, etc
2 The first film demonstrated to the audience was "The Arrival of a Train at La Ciotat Station". This film shows an ordinary aspect of everyday life,videlicet,the arrival of a train pulled by a steam locomotive to a train station in the French town - La Ciotat.
3 The  first theatre in London was called "The Theatre".
4 There are such categories as G(general audience), PG( parental guidance suggested), PG-13( parents strongly cautioned), R (restricted) NC-17 ( no one 17 and under addmitted). 
5 They were westerns,comedies and war films.