2 i didn't study/ i listened to music
3 he woke up/ he didn't feel well
4 she didn't buy a camera/ she didn't have money
5 we didn't open a letter/ it wasn't for us
6 they drank some lemonade/ they didn't eat anything 
7 he didn't do his best/ he didn't win the race

3 
2 I didn't study last night. I listened to music 
3 He woke up at 3 am last night. He didn't  fell well 
4 She didn't by a camera because she didn't have the money 
5 We didn't open the letter because it was for us 
6  They drank some lemonade because they didn't eat anything
7 He didn't do his best so he didn't win the race
4 
2  Did the film finish / didn't watch
3  Did your brothers drink / didn't 
4 did she meet/ met/didn't remember 
5 Did you invite/ did/ invited / seemed