Past simple или past continuous.

1) established (основали)

2) met (встретились)

3) were working (работали)

4) were sharing (делились)

5) realised (поняли)

6) decided (решили)

7) registered (зарегистрировали)

8) went (вышли)

9) became (стал)

10) were uploading (загружали)

11) were watching (смотрели)

12) were attracting (привлекло)

13) sold (продали)