Here are the completed sentences using the correct forms of the provided verbs:

1) You **were invited** to the wedding. Why didn't you go?
2) Originally the book **was written** in Spanish and a few years ago it **was translated** into English.
3) A cinema is a place where films **are shown**.
4) The room **is cleaned** every day.
5) It is a big factory. Five hundred people **are employed** there.
6) Five million bottles of Champagne **will be produced** next year.
7) This exercise must **be done** carefully.
8) I think we **should follow** the instructions.

Let me know if you need anything else!