These continual _____ in temperature make it impossible to decide what to wear.

The _______ is just around the corner and you won't miss it.

Small ______ you are called early bird --- you always catch the first train to work!

At the meeting they discussed three dif-ferent_______to the study of mathematics。

There is no      in trying to persuade him to change his mind, for he never follows the advice of others.