Here are more idioms. Can you write one in each sentence, and guess what it means?

1. I’ve been in the job a few days, but I already feel at home.
   
2. I’ve just bought these shoes and they cost a fortune.
   
3. Could you keep an eye on my bag for me?
   
4. The answer’s on the tip of my tongue.
   
5. We had a night on the town last night.
   
6. I could do with a new computer; mine’s quite old now.