Read choose and complete.(20 marks) на языке как будет перевод

прочти, выбери и реши. 20 отметок

i have never seen him before. 

what are you doing? -i'm eating a tasty cake. can i take a piece, please?

1.when the bell rang the children  ran into the classroom and took their seats.

2. when i opened the door, the lesson  began and the teacher was  explaining something to the class  

3.before we  took the boy to the theatre he  had never    seen a play.

4.i  was  cleaning  the carpet when the dog came and  shook himself

5.by the time we had  arrived the party had  already finished

6.-what were you doing when i called you? - i was cooking