Where did you see him for the first time?— It was in the factory _________ we worked.

Having worked abroad for five years, he_________ much experience in dealing with international affairs.

So far, _______ of the students in our class_______ seen the film.

Do you need more time to finish the work — Yes, another ten days ______ enough.

Thechairman thought ________ necessary to invite Professor Smith to speak at themeeting.