Complete the sentences opening the brackets. 1)When the bell rang the children (to run)into  the classroom and(to take)their seats.2)When I opened the door ,the lesson (to begin)and the teacher (to explain)something to the class.3)Before we (to take)the boy to the theatre he (never to see)a play.4)By the time we (to arrive)the party(to finish). 5)-What you (to do)when I (to call)you? - I (to cook). 6)When I (to get )to the playground my friend already(to leave). 7)We (to have)a good long holiday after we(to do)all the work.