Jane likes to give her students a lot of _______ on how to improve their English. 

 At the foot of the hill you could hear nothing but the ________ of the running water.

—Have you ever corrected these compositions ?—Of course．They are based on true stories．Most of them are from personal _______．

---What’s your favorite ______?            ---Hamburger.

The ____ of some wild animals reminds us __ the problems on environment.