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Odpowiedź:
1 We were given tickets to the theatre.
2 Tu w sumie nie wiadomo, jaki to czas, bo let (wpuszczać) ma trzy formy takie same (let, let, let), więc to może być:
a) Students are let into museums for free. (Studenci są wpuszczani do muzeów za darmo)
b) Students were let into museums for free. (Studenci zostali wpuszczeni do muzeów za darmo)
3 That wall wasn't built by the Romans.
4 The Hobbit was written by J.R.R. Tolkien.
5 The art galleries weren't opened during the holidays.
6 A map of Central Park wasn't needed.