Choose when or if

1. Don't worry [when|if] I'm late tonight.
2. Sam might phone while I'm out this evening. [When|If] he does, can you take a message?
3. I'm going to Paris next week. [When|If] I'm there, I hope to visit a friend of mine.
4. I think Jane will get the job. I'll be very surprised [when|if] she doesn't get it.
5. I'm going shopping. [When|If] you want anything, I can get it for you.
6. I'm going away for a few days. I'll phone you [when|if] I get back.
7. I want you to come to the meeting, but [when|if] you don't want to come, that's all right.
8. We can eat at home or, [when|if] you prefer, we can go to a restaurant.