Answer: When the bell rang, all the children got up from their seats and ran out
Step-by-step explanation:
To complete the sentence, we need to add some verb that shows motion, as the following words show that the students ran out. Hence, the term 'got up' completes the sentence because the children would have stood up from their seats to run out of the class once the bell rang.
Therefore, the words effectively complete the sentence and make sense.