Future Simple

Ex.1 Which is correct?

1. A Did you phone Ruth?
B Oh no, I forgot. I phone/I'll phone her now. (I'll phone is correct)
2. I can't meet you tomorrow afternoon. I'm playing/ I'll play tennis. (I'm playing is correct)
3. A I meet/I'll meet you outside the hotel in half an hour, OK?
B Yes, that's fine.
4. A I need some money.
B OK, I'm lending/I’ll lend you some. How much do you need?
5. I'm having/I'll have a party next Saturday. I hope you can come.
6. A Remember to buy a newspaper when you go out.
B OK. I don't forget/ I won't forget.
7. What time does your train leave/will your train leave tomorrow?
8. I asked Sue what happened but she doesn't tell/won't tell me.
9. A Are you doing/will you do anything tomorrow evening?
B No, I'm free. Why?
10.I don't want to go out alone. Do you come/will you come with me?
11. It’s a secret between us. I promise I don't tell/I won't tell anybody.