Try to understand the italicized words in the following sentence

Try to understand the italicized words in the following sentences from the context. Write the word(s) in the space given after each sentence. 4. Sophia took a hard look at him; an astounding transformation had taken place. No longer did he appear lackluster or even middle-aged. His expression sparkled, his clean-shaven face was flooded with color; his eyes now bright, clear and knowledgeable.(transformation)_______
【正确答案】：change
【题目解析】：P126