Join these sentences using the past perfect tense.

1. Naveen had finished cooking when he went to sleep.
2. I had reached the concert hall when the program started.
3. I had visited my aunts in Delhi before I returned to my hostel.
4. Gunjan had finished the painting when the telephone rang.
5. Suman had extinguished the fire when the fire brigade arrived.
6. They had finished reading the poem when the bell rang.
7. We had reached the bus stop when the bus drove away.
8. The officer had arrived at the spot when the culprit ran away.
9. I had made up my mind when my parents arrived to discuss the matter.
10. She had finished laying the table when the guests arrived.