Complete the conversation. вставить слова 1 a. can i sit here? b sory. - i m travelling with a friend. 2 a. ok if i open the window? b. no 3.a. if i se your phone? i promised to phone my dad. b. do.

1. Can I sit here? 
    Sorry, you can't. I'm travelling with a friend 
2. Is it OK if I open the window?
    Sure, no problem.
3. Do you mind if I use your phone? I promised to phone my dad.
    No, please do