Complete the conversation using will 'll or won't .

Tim: I want to go walking with Ruth in the Lake District.
        Is that ok ?
Father: The Lake District ? That's a long way . How ( you get ) .............there ?
Tim: We ( go ) .........by bus . It (not take ).............very long.
Father: What time ( you be ) ...........back ? 
Tim :  I don't know but we ( not/be) ..........very late .
Father : Fine. I (keep) .......some supper for you .
Tim:Thanks.
Father: Now , (you be ) ......all right ? 
Tim: Of course we ........! Don't worry about us .We (be) ......fine!