ten o'clock
The slide was farther away than Shorty had said , but proved to be very good when they did reach it , and they enjoyed it so much that the time slipped away unheeded , until presently the town clock on the hill above them boomed out ten , in notes of solemn warning . `` My sakes ! '' exclaimed Bert , in alarm . `` There 's ten o'clock . What will we do ? '' `` Guess we 'd better not go to school at all . Mr. Garrison will never miss us , '' suggested Shorty .