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1) Jason is very tanned, just as if he were at the seaside during his holidays.
2) Jason spent his holidays with horses, because his uncle works with horses on farm, and Jason was allowed to help him. His job responsibilities were to take care of the horses — to feed and groom them — and to clean the stables.
3) Jason certainly worked not for money, but for fun and pleasure looking after horses. I think so because he says that horses are so beautiful, that he enjoys spending time with them even though he came home more dead than alive.
4) I think Julia didn’t work during her holidays, because she was really shocked, when Jason told her, that he had worked. I suppose Julia was busy with relaxing, watching videos and going to discos.
5) Julia feels very surprised with the fact, that her friend has been working during the holidays. She even thinks that he is silly, as he is going to continue working at farm after summer. So, of course, she treats Jason just like a fool.
6) I think that Julia thought a little bit and decided to go working at farm with Jason.