COMPLETE THE SENTENCE WITH THE RIGHT FORM OF THE VERB IN PAST PERFECT TENSE.
1. When I arrived at the station, the train (leave)_________________.
2. My friend (live)___________in China before she moved to American.
3. They (never been) _______________ here before.
4. After I (finish) __________ my breakfast, I went to work.
5. The student (not finish) __________their assignments so they were in great troubles.