1) By 9 p.m. yesterday she __had done_ her homework. (to do)
2) At 5 o’clock yesterday she_was playing_ the piano. (to play)
3) Father _had come_ home by 6, and at 7 he _was having_ dinner. (to come, to have)
4) When I _met_ Tom, he was eating_ an ice-cream which he had bought_ at the corner of the street. (to meet, to eat, to buy)
5) When father_came_ home, we _were cooking_ the mushrooms. (to come, to cook)
6) By 2 o’clock yesterday the teacher _had examined_ all the students. (to examine)
7) On my way to school I __remembered_ that I had left_ my books at home. (to remember, to leave)