8. That the Lord was going to come back from having ascended into heaven.
9. The coming presence of Christ (His return presence) is connected with the resurrection.
11. Chapter fifteen of 1 Corinthians is also a resurrection passage and it is also saying that the resurrection (general resurrection, see Learning Activities #51 and 51A-D) take place at the same time as the Parousia (presence, appearing, coming) of Christ which actually happened in AD 70 (see Learning Activity #34).
13. Three years.
15. Fourteen years.