Answer:
I think it's 2. the work of the Holy Spirit
5. the Christian hope
and 7. the centrality of the cross
Step-by-step explanation:
Paul expresses his thanks in his letter to the Philippians. He tells them that they have to live a life pleasing to God. He also talks about our hope as Christians. His letter also alludes to the work of the Holy Spirit, because Paul preaches about Jesus Christ when he's filled with the Spirit. In a way, Paul also tells about the centrality of the cross, since he says indirectly that Jesus is the center of it all. Hope I helped, have a nice day :)