Модальные глаголы gen.

[Тата7]

Здравствуйте,
Проверьте пожалуйста употребление модальных глаголов:
1. You must drive on the left in the UK.
2. If you feel tired yo should go to bed.
3. You have to work hard if you want to pass your exams.
4. If you have heart trouble you shouldn't smoke.
5. If you want to go clombing you have to buy some shoes.
6. In some countries you oughtn't to pay extra for school textbooks.
7. You mustn't borrow people's things without asking them first.
8. If you want to go on a sailing holiday you must learn to swim.
9. All travellers to China ought to have a visa.
10. You don't have to pay to join a library in the UK as it's free.

Огромное спасибо за ответы.

[grachik]

1. you (опечатка)
5. climbing (опечатка)

Вроде, все остальное правильно

[натрикс]

6. In some countries you needn't / don't have to pay extra for school textbooks.
9. All travellers to China must have a visa.
остальное - вкусовщина. но я лично думаю, что в 4 - mustn't, а в 7 - shouldn't учитель захочет.