<prompt> Translate the following text to SwahiliSince I became Comptroller General, one of the most important activities in which GAO has been engaged is the development of its first strategic plan for the 21st century.  <response>: Tangu kuwa Msimamizi Mkuu, moja ya shughuli muhimu zaidi ambazo GAO imekuwa ikifanya ni maendeleo ya mpango wake wa kwanza wa kimkakati kwa karne ya 21. 