Which is right?

1 If I'm / I'll be late this evening, don't wait for me. - I'm is right
2 Will you write to me if I give / I'll give you my address?
3 If there is /will be a fire, the alarm will ring.
4 If I don't see you tomorrow morning, I phone / I'll phone you in the evening.
5 I'm / I'll be surprised if Martin and Julia get / will get married.
6 Do you go / Will you go to the party if they invite / they'll invite you?