1. be kept (Present Simple Passive)
2. was built (Past Simple Passive)
3 was being painted (Past Continuous Passive)
4 have already been sold out (Present Perfect Passive)
5 will be opened (Future Simple Passive)
6 was put out (Past Simple Passive)
7 is made (Present Simple Passive)
8 was returned (Past Simple Passive)
9 will be sent (Future Simple Passive)
10 has been visited (Present Perfect Passive)