Read the sentences and choose the correct variant.
1. Has anybody asked ____ me while I was away?
2. She promised to call back ____ an hour.
3. We wanted to hide ____ a big storm. He didn't want to get wet.
4. ____ this occasion I would like to express my thanks.
5. I lost my passport _____ the way to Madrid.
6. Some people are _____ prison for crimes they have not committed.