Flight EP 476 to Yerevan has been __ canceling __ cancel canceled

## Step 1
The sentence is in the present perfect tense, which is used to describe an action that started in the past and continues in the present. In this case, the action is the cancellation of the flight.
## Step 2
The verb 'cancel' needs to be in the past participle form to fit the tense of the sentence. The past participle of 'cancel' is 'canceled'.
## Step 3
Therefore, the correct word to complete the sentence is 'canceled'.