Complete the sentences with for or since.
1. John and this girlfriend have known each other ...... primary school.
2. I’ve been interested in politics ever ......
3. George has been out of work ... three years now.
4. I’ve believed that opposites attract .... I met Laura.
5. Josh has been a web designer .... he finished high school.
6. I haven’t given a speech .... I was at university.
7. We’ve kept this company going ..... over twenty years.