Какой из якорей означает, что город - речной порт, а какой говорит о том, что город Санкт-Пeтepбypг имеет выход к морю

1) I have a toothache. If I had gone to the dentist before, I wouldn't have suffered now.
2) I would have done better in my maths exam if I had revised. But I had no time.
3) He would be rich if he were a businessman. (ИЛИ He would have been rich if he had been a businessman)
4) If she hadn't driven so fast, she wouldn't have met with an accident.
5) If he had gone to university 5 years ago, he wouldn't have become a rock star.
6) It rained all day. If the weather hadn't been so bad we would have gone out.
7) We expect Mary to be here soon. If she doesn't arrive we will phone her.
8) I sleep badly. If I got enough sleep I would do better at school.
9) We went to Paris. If we hadn't gone to Paris we wouldn't have had such a good time. 10) My brother doesn’t do any work. If he works harder he will pass his exams next month.