Based on the context and the answer, generate a question. 

Context: I forgot to top - up my card ! " And with no small change with us , we were forced to walk from the apartment beside Greenview Sec all the way to Pasir Ris MRT station . I could have taken the bus , but being a good person that i am , i walked with my sister .

Answer:

They walked instead of taking the bus .



Why may the narrator 's legs be so sore and tired ?