Not one of those scriptures tell us of a pre-trib rapture.
Read the sequence of events in Matt 24 and Mark 13 which unequivocally tell us of a post tribulation return of Jesus.
In Luke 21 Jesus describes the bitter things that will come upon the wole earth. At verse 28 He says, "Now when these things BEGIN to happen, look up and lift your heads, because your redemption draws near."
My question to you is, if the rapture happens at the end of the tribulation, and all the bitter things described in Luke 21 have already happened, or nearly all, then why didn't Jesus say something like, "Now when these things are nearly ended, lift up your heads..." Instead of "when these things BEGIN to happen?"
There is a beginnign to "these things" and there is an end... it is at the beginning that we are encouraged to lift up our heads, not at the end...