Помогите пожалуйста!

Исправьте ошибки. 
1. — They have bought a new house.
— Really? I'd like to see a house.
2. I'm sure you will like their house.
It's the very nice house.
3. Do you go to school by a bus?
4. Her lesson starts at 10 o'clock. She
mustn't get up at 6 o'clock.
5. I didn't (didn't не изменять) have any stamps at home.
I must go to the post-office.
6. Did (Did не изменять) he must to see  the doctor?
7. It was (was не изменять) late. We must take a taxi.
8. You mustn't get up early. It's Sunday.
9. Kate mustn't go to the doctor. She
was (was не изменять) not ill.
10. Yesterday (Yesterday не изменять) I must write the test again.

Заранее огромное спасибо!!!!!