Read the sentences and choose since or for.
1. I've lived in Vienna ..... 3 years.
2. I've been working on the project ..... January.
3. I haven't visited my home town ..... I left school.
4. Johan has been in England ..... more than two weeks now.
5. He's worked in this department ..... December.
6. The cake has been in the oven ..... half an hour.