Расшифруйте следующие роли печени в пищеварении: "печка организма", "продовольственный склад"', " лаборатория", "барьерная роль"

1. you are on a train. ask someone you don't know to close the window

        - do  you mind of opening the window?

        - no, i don't.

        - could you help me because i don't know how to do it.

        - sorry, i'm afraid. i can't.

        - but why? why not?

        - because of my fingerache. i've broken it.

        - oh, awful!   it's a pity.

        - you have to ask someone else.

        - of course, i have. it's terribly hot. what can we do?

        - let's try to look for somebody who will be able really to

3. you see your middle-aged neighbour in the street. ask him/her to post a letter for you

      - how do you do, nina vasilievna?

      - i'm fine, thanks. what about you?

      - thanrs, fine.

      - what can i do for you?

      - would you post a letter for me, i have no time,  i  have to go to meet my little sister after her classes.

      - with a pleasure. whom have you written a letter?

      - to my elder brother.

      - isn't he at home?

      - oh, no. he has left to moscow to enter the university.

      - well, give me your letter. i must go.

      - thank you very much.

      - never mind.