Помогите раскрыть скобки,объясните свой выбор One day a Paris newspaper (have) an advertisement about a very cheap way

One day a Paris newspaper had (Past Simple) an advertisement about a very cheap way of travelling. Many people believed (Past Simple) it and sent (Past Simple) their money. A few days later each got (Past Simple) a letter. The letter read (Past Simple): \"Sir, rest (Present Simple) in bed and remember (Present Simple) that the Earth turns (Present Simple). Paris turns (Present Simple) together with the Earth. You travel (Present Simple) more than 25,000 kilometres a day. You may (Present Simple) look (after the modal verb \"may\" we use the main verb in the 1st form) out of the window and enjoy (Present Simple) your journey.\"