近年来,中国有越来越多的城市开始建造地铁。发展地铁有助于减少城市的交通拥挤和空气污染。 In recent years, more and more cities in China begin to _____1____. Developing the subway is good for reducing the ____2_____ in cities. 地铁具有安全、快捷和舒适的优点,越来越多的人选择地铁作为每天上班或上学的主要交通工具。 A growing number of people choose subway as their main means of transportation to go to work or school every day for its advantages of ___3___, fast speed and ____4___. 如今,在中国乘坐地铁正变得越来越方便。 Nowadays, ___5____the subway is becoming more and more ____6____ in China. 在有些城市里,乘客只需用卡或手机就可以乘坐地铁。 In some cities, ____7____ can use a card or a mobile phone to take the subway. 许多当地老年市民还可以免费乘坐地铁。 Many local elderly citizens can also take the subway ___8____.