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I was an eccentrical and naive young man those days.
Would you mind if I close the door? It's too noisy in the corridor.
Children have made their way up, trying not to wake up their parents.
It won't be bad (will be good) for you if you spend more time outside.
The teacher looked at Nick and Nick hid his cheat sheets in the desk

1. В те дни я был взбалмошным и наивным юношей. - I was an eccentrical and naive youngster those days.
2. Вы не возражаете, если я закрою дверь? В коридоре слишком шумно - Would you mind my closing the door? It's too noisy in the corridor.
3. Ребятишки пробрались наверх, стараясь не разбудиьт своих родителей. - The kids had made their way upstairs trying not to wake up their parents.
4. Тебе не повредит, если ты будешь больше времени проводить на воздухе. - It would do you good to spend more time in the open air (outside.)
5. Учитель посмотрел на Ника и тот спрятал шпаргалку в парту - The teacher looked at Nick, and Nick hid his cheat sheet in (at) the desk.

На что собственно перевести-то?))

1. Those days I was eccentrical and naive the young man.
2. You do not object, if I close a door? In a corridor it is too noisy
3. Children have made the way upward, trying not разбудиьт the parents.
4. To you will not damage, if you of more time spend on air.
5. The teacher has looked at Nika and that has hidden шпаргалку in a school desk - английский

на какой язык?