Bonjour.
Exercice 1 :
1) I was drinking.
2) She was dreaming.
3) They were talking.
Exercice 2 :
1) was singing / entered
2) was studying / disturbed
3) were chatting / interrupted
Exercice 3 :
1) was dancing / stormed in / scared me
2) was laughing / fell
3) adopted
Bonne journée !