Révision des temps en anglais : All tenses review

Complete the following sentences using the most appropriate tense (Present Perfect Simple/Continuous, Past Simple, Past Continuous, or Past Perfect). Pay attention to the logical sequence of events and time markers:

1. Sarah (arrive) __________ at the station at $8:00$ PM, but she realized that the train (already/leave) __________ at $7:45$ PM.
2. While Mark (prepare) __________ his presentation all afternoon, he (suddenly/hear) __________ a loud noise outside.
3. She (work) __________ for this company for $10$ years, and she still enjoys it every day.
4. By the time the manager (enter) __________ the office, the team (already/finish) __________ their project, which cost them $5 \times 10^3$ euros.