One Sunday several former classmates gathered at Tom’s for lunch, ______ their high schoolreunion the year before.

There was a very interesting remark in a book by an Englishman that I read recently ______ he thought was the reason for this American characteristic.

___ to give up smoking, he threw away his _____ cigarettes．

You can’t imagine what difficulty that deserted cats will have _____ through the frozen winter.

When he is awake, he always keeps his eyes       on the ceiling.