Solution:The question is incorrect in itself as there are two errors in the same question. Firstly, ‘No sooner did I reach’ is needed to be replaced with ‘No sooner did I reached’ as No sooner / hardly / scarcely + did + subject + base form of the verb is used. Secondly, such sentences beginning with No sooner, hardly, scarcely etc. take ‘perfect form of tense’. Hence ‘the children left the place’ is needed to be replaced with ‘the children had left the place’.