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1 He opened the door, entered the room and looked around
2 They had been walking for hours before they reached their destination
3 We were standing outside when we heard a strange noise in the house
4 She had broken her leg and coudn't take part in the compitition
5 She was singing while she was tiding her room
6 We had not finished the test by the end of the lesson
7 I visited granny because I had wanted to congratulate her with her birthday
8 My tooth had been hurting for a week befire I went to the dentist
9 He had locked the door and left for work
10 He had been writting poems for years before he became famous

2) were walking, 3) were standing, heard, 4) broke, 5) was singing , was tidying, 6)didn't finish 7) wanted, 8) was hurting , went  9)locked, left, 10) was writing