Раскройте скобки, выбрав правильную форму.
1) Many different languages (to speak) in the world.
2) We (to sell) a lot of equipment recently.
3) Our economists (to visit) the exhibition now.
4) How (many/much) people work here?
5) He (to spend) some time in the UK last month.
6) I will be happy, when I (to pass) my exams.