Final answer:
The missing word is 'el metro' which means 'the subway' in English.
Step-by-step explanation:
The missing word that best completes the sentence is 'el metro'. The sentence 'Camina para llegar a la tienda' translates to 'Walk to get to the store' in English. In this context, 'el metro' means 'the subway' and is the most appropriate word choice to describe a means of transportation used for walking to the store.
Learn more about Spanish vocabulary and transportation