I . 根据句意及所给汉语提示,写出句中所缺单词。 1. Many people stood up and ________ ( 欢呼 ) when that movie star walked into the hall. 2. Tom ________ ( 义务做 ) to work at the old people’s home once a week last year. 3. We saw some ________ ( 标志 ) around the lake. They say, “No swimming in the lake.” 4. There are ________ ( 通告 ) about where to park ( 停车 ). 5. Tom didn’t feel ________ ( 孤独的 ) because he made new friends here.