Отмечу как лучший ответ)

1: when I saw my friend, he was reading a book which he bought...

2: he was living in his...

3: I came, sister was preparing, gave us.

4: i opened, i saw, came, students were writing a test

5: she told, she worked.

6: been very surprised, She never wasn't late before.

7: i returned, we were carrying out.

8: the rain stopped, i was looking, and saw that the wind broke down a tall tree.

where is the headmaster’s office in school?    

do you often ********* to the nurse’s room?          

there is a large computer study in our school.         

you can find miss alison in the staff room.

во втором предложении пропущен глагол. проверь. он должен стоять на месте звездочек.

yury.vitalii.vladimir