Необходимо вставить пропущенные буквы: _ct_pus _o-_o

1. my friendn had studied english before he entered the institute 2.the car had  gone when looked into the street 3.he had taken the decision before i came 4. mck hadreturned from office by seven o,clock 5.we got to the stadium at four o,clock but the game had already started 6. she came at six o'clock 7. i thought that my parents hah already returned 8. he was sure that that we had not recognized him 9. Did you find your key which you had lost before 10. Meg said that she had been in this city 11. The doctor  arrived when we had already helped him

1. My friend  had   studied  English before he  entered  the institute

2.The car  had gone when  we  looked  into the street

3.He  had taken  the decision before  I came

4. Nick  had returned from office by seven o,clock

5.We  got to the stadium at four o*clock but the game had  already started

6. She  came at six o'clock

7. I thought that my parents  had already  returned

8. He was  sure  that that we  didn*t  recognize  him

9. You   found  your key which you  had lost  before / Did you   find  your key which you  had lost  before?

10. Meg said that she was in this city/Meg said that she had been in this city

11. The doctor  arrived  when we  had already  helped  him

в некоторых предложениях возможны 2 варианта. проверь знак вопроса в пр. № 9!