根据下列句子的意思及所给的汉语、英语及首字母提示,写出空缺处词语的正确形式。 1. Students should pay attention to l___________ to the teacher in class.. 2. Tomorrow is my father's ___________ (四十) birthday. 3. He ran so fast that he ___________ (赶上) the early bus yesterday. 4. She was ___________ (shock) at the news that a volunteer from Hong Kong died in Yushu earthquake. 5. I ___________ (luck) got a chance to be a volunteer for the 2010 World Expo.