if or when?

I'm going away for a few days. I'll phone you _____ I get back.

• if
• when

The Millers will buy a new house _____ they are rich.

• if
• when

____ we don't hurry up, we'll be late !

• if
• when

We are going to the supermarket, _____ you need anything, we 'll buy it.

• if
• when

I am going to Berlin next month. _____ I'm there, I'll visit a friend of mine.

• If
• When

We can eat at home or, ____ you prefer, we can go to a restaurant.

• if
• when

Come and see me _____ you have finished!

• if
• when

I won't go to the party _____ my girlfriend doesn't go.

• if
• when

Mike will watch television ______ he has finished his homework.

• if
• when

____ I were free I would do only what I like.

• if
• when