Complete the sentences correctly with the prepositions For or Since: Mr. Wilcox has been a teacher [for] 30 years. He has worked at Vancouver Unive...

Complete the sentences correctly with the prepositions For or Since:
Mr. Wilcox has been a teacher [for] 30 years.
He has worked at Vancouver University [since] he was thirty.
Jason and Chuck have studied together [for] five years.
Sarah has eaten three hamburgers [since] 6 pm.
Bruno’s parents have been married [for] six years.
Steve has known his best friend jason [since] college.
My friends have been in the USA [for] three months.
Bruno and Carlton haven’t eaten anything [since] breakfast.
Chuck and Jason have played video games [for] two hours.
Jason has done nothing [for] three hours.