帮我翻译一下句子,谢谢,英语阅读理解的

帮我翻译一下句子,谢谢,英语阅读理解的1) Manyvisitors come to the writer’s city to ________.2) Someshops can be built Dongfeng Square so that they may _____.3) Airpollution is the most serious kind of pollution because _____.4) Why didthe writer get off the train two stops before Vienna station?