Choose the correct options

1. I
   [was sitting| am sitting| sat] on a bench and reading an article when John
   [was coming up | came up| had come up] to me.
2. When Sara
   [arrived| was arriving| have arrived] at the airport, she saw some flight attendants for the first time in her life.
3. Jessica
   [had watched | was watching | watched] a film when she heard somebody knocking on the door.
4. Yesterday Nick
   [was going| have gone| went] to the library, then he
   [have had| was having| had] lunch, and after that he
   [was meeting| met| had met] his supervisor.
5. Andrew
   [was spraining|sprained| have sprained] his ankle when he
   [was fleeing| flee| fled] from the police officers.
6. When the manager
   [was entering| entered|  had entered] the office, everybody
   [danced| was dancing| were dancing].
7. On holidays we
   [have gone| were going| went] hiking,
   [were swimming| swam| have swum] in the lake and visited the historic centre of the town.