How's your time spent in the United States ?   Well , pretty good .   I'm glad to hear that . What impressed you most ?   Well , the cultural differences impressed me most .   You mean we Chinese think differently from the Americans ?   That's right , quite different . One day one of my American friend looked pale , so I asked him whether he was sick or not . But he was reluctant to answer my question .   That's weird .   And what's more , when he told me he had caught a cold for several days , I suggested him to go to the hospital as soon as possible .   You really cared about your friend . 