修改下列病句。     
1．我国有世界上没有的万里长城。
                                                                                                                              
 2．今天一大早，妈妈从市场上买来蔬菜、黄瓜、西红柿和青椒等。
                                                                                                                          
3．海底世界有许多奇怪的稀奇动物。 
                                                                                                                          
4．人人都遵守交通规则，我们的安全和事故就有了保障。
                                                                                                                              
5．我们要保护漓江、太湖、故宫、北戴河这些自然风景区。