eleven o'clock
Do you understand ? '' Dorothy evidently did , for she subsided quietly into her desk , and the other girls took warning and behaved themselves . For five minutes a blessed peace reigned in IIB . Nobody was more absolutely thankful when the eleven o'clock bell rang than Lesbia . The ordeal of her first lesson was over , and , though things had not gone altogether smoothly , she had managed the form by herself , and had not been obliged to call in the assistance of any other teacher to read the riot act . `` They 're imps ! Sixteen cheeky , mischievous imps ! ''