I don't think Speechless would do well as a single, especially on radio. Monster would be the best choice. DITD sounds too 80s, and although SHICD is a good song, Monster is >>>>>>>. Teeth is actually good, but we know that's nowhere close to single material.
I
still think she should pull a Rehab/Radar/whatever you want to call it and release Starstruck.

And I still think it would go to #1 after all these months without a proper single release.