We all know that our teachers have different _______of teaching

—You are always full of _______.Can you tell me the secret?—Taking plenty of exercise every day.

Many students like to recite       , which are short,beautiful and rhythmic.

The ________ for tonight’s talk is protecting the environmet. 

I listened to Dr.Wilson’s lecture about the protection of wild animals,but I was unable to grasp its key _________.