问题描述：
根据首个字母完成短文
BY UNDERGROUD (H ) are two routes:One from the east to the west;the (o ) round the city like a ringroad.The underground trains are (f ）but crowded during the rush hours.
BY TAXI Taxis are fast,but they are a bit (e ).
BY UNDERGROUD (H ) are two routes:One from the east to the west;the (o ) round the city like a ringroad.The underground trains are (f ）but crowded during the rush hours.
BY TAXI Taxis are fast,but they are a bit (e ).
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