The children have been playing with my hat ---they’ve knocked it out of _____. 

There are many people who have a          like yours, but they don’t believe they have the power to do anything to improve our environment.

Before the final examination,many students have shown      of tension.Some have trouble in sleeping while others have lost their appetite(胃口).

As a parent, you ought to set a better _____ to your children, who learn bad behaviors quickly.

 If what you are teaching doesn’t _____ to your students, your students will gradually lose interest in it.