Video editing and duration issues

I have a 8 minute video, I cut out 90 % of it and ultimate had 26 sections of clipped videos of varying lengths from 1 second to 3 seconds.   I want to take the clipped video segments and make the all 2 seconds long.   I highlight them all and adjust the duration.   However, on the clips that are 1 second long it brings back part of the video I clipped off - I don't want that to occur.   I just want the 1 second clipped video to slow down to 2 seconds and the 3 second clipped video to speed up to 2 seconds (that part works great).   I have tried to search for an ansser - I can't find it.   Newer to Premier Pro - thanks for any help.