Answer:
Waited
Step-by-step explanation:
Verbs can be transitive or intransitive. When they require an object in order to express a complete thought or make sense, they are called transitive (such as bring, convey and throw) but when they do not require an object in order to make sense, they are intransitive (for example, jump, run, sing and wait). Sometimes, however, some verbs can be used as both intransitive and transitive, depending on how they are used in the sentence, like park, which can take an object or not.
In the sentence, there are two verbs: parked and waited. Parked is being used as a transitive verb because it takes an object: the car, while waited, by nature, is an intransitive verb because it does not need to take an object in order to make sense.