E):
1.Before we (sit) at table,Peter (show) the flat to you.
2.When Granny (look) out of the window the children (play) volleyball. 3.I (have dinner) already when my friend (come). 4.When I (write) a letter he (do) English exercises.5.I (know) Peter since my school years. 6.By the time we (arrive) they (sell) all the tickets. 7.He was to meet her but he (cannot). 8.Soon (there be) many young trees in the park.
looked, were playing
had have dinner, came
wrote, was doing
have known
arrived, had sold
couldn't
there will be