Question

A ________ becomes a ________ when repeated testing of its predictions does not disprove it.

Answer 1

A "Theory" becomes a "Fact or Law" when repeating testing of its predictions does not disprove it.
Some theories like Einstein's Theories of General and Special Relativity have been thoroughly tested and are still not put into "law" because we haven't been able to prove it nor disprove it yet.