nine
o'clock
`` What 's that ? '' cried Mollie , startled , as a loud knock sounded on the door . `` I wonder who is coming to visit us so early ? '' `` Probably one of the boys , '' Betty suggested , `` come to tell us it is nine o'clock and high time we were up and dressed . '' `` Nine o'clock ! '' Grace fairly stuttered , but just then Mollie called out an impatient : `` Who 's there ? '' in response to a second and harder knock at the door .