A cough is usually nothing to worry about unless it lasts for ten days _____

He began to take political science ____ only when he leftschool.

Having won the first place in the English examination, Tom ran back home,       .

 She was not______ frightened; in fact, she was nearly frightened to death.   

Mary is very clever and _____ worth teaching, but her brother is not. Look, he is now _____ asleep in class.