Sentence:  Bob Carroll may not bear quite as close a physical resemblance to LaGuardia as Tom Bosley does , but I was amazed at the way he <WSD>became</WSD> more and more Fiorello as the evening progressed , until one had to catch one's self up and remember that this was n't really LaGuardia come back among us again . 
Meaning of the word marked with <WSD> tags:  undergo a change or development