Read the sentences and choose the correct variant.
1. He should come ____ a few minutes.
2. It didn't happen yesterday but the day ____ yesterday.
3. There's an excellent restaurant ____ the end of the street.
4. You must check the petrol ____ regular intervals.
5. I was _____ Peter's last night.
6. It was a very long voyage. We were _____ sea for 50 days.