El criminal chocó su carro con un árbol mientras ________ de la policía.
Answer: El criminal chocó su carro con un árbol mientras huía de la policía.
The criminal crashed his car with a tree while fleeing the police.
Explanation: The action of the verb "huir" was happening until the car hit the tree, so it must be conjugated in the imperfect.
[tex]\textit{\textbf{Spymore}}[/tex]