Answer:
Consequently
Step-by-step explanation:
'Clue words' are the words or phrase that signals the meaning of a specific word or perspective in which the author is taking the idea. In the given sentence, the word 'consequently' is the keyword which indicates that the latter action('being late for the baseball game') was the effect of the previous action('locking keys in the car'). It helps the readers understand that the first action is the cause for the second and hence, display a cause.