I don't usually watch thrillers because I don't like violence or to be too nervous during film watching. To be honest, I am not a fan of musicals because I don't like singing but if a friend wants to watch any, I, of course, will come along with them. Also, I'm not keen on watching the cinema; I can a system to learn so

Выберем подходящий вариант из предложенных:

1. sci-fi films
2. documentaries
3. black and white films

По смыслу больше всего подходит вариант "documentaries", так как в них обычно не требуется "big screen and a good sound system".

Вставим слово в предложение:

I'm not keen on watching documentaries because I find them quite boring for watching at home.

Ответ: documentaries