Final answer:
The missing word is 'el capó', which means 'hood' in English.
Step-by-step explanation:
The missing word in the sentence is el capó, which means 'hood' in English. So the complete sentence would be 'Tuvimos que levantar el capó para ver el motor.' Here, 'el capó' refers to the front cover of a car that needs to be lifted to access the engine.
Learn more about Spanish car vocabulary