根据首字母及汉语提示，完成下列单词的拼写，使句意明确，语言通顺。
If you get your ears ________(穿孔) , your head teacher will be angry with you and you will break school rules.
What about reading aloud to practice p____________(发音)？
As a teacher, you must c____________(全神贯注) on your work .
The air pollution in this area caused the ________(死亡) of many trees.
He is t________ （害怕）of speaking in public.