Pic1 - Zulag4, The Board Room
Pic2 - Zulag1, First Part
Pic3 - Zulag1, Second Part
Pic4 - Zulag1, Secret Area C (you need to go there to get grenade which help you to get SecretB)
Pic5 - Zulag4, Second Part
I give chance to rest of users
btw: Why Pic9 and Pic8 are shown in reverse order?