He hardly spent any time on his subjects, _________—_________, so he did badly in his lessons.

The urge to go abroad for further study is strong, but it was not until last summer ________ I knew how powerful it could be.

They went on well at first but eventually everything ________ they had worried about happened.

It was along the Mississippi Rever ____Mark Twain spent much of his childhood.

Class regulations state _____ is the last to leave theclassroom _____ off all the lights.