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。
It is i_________ (重要的) for you to keep healthy.
He r __________ (收到了) a story-book on his last birthday.
We shouldn’t throw rubbish e ________ (到处) to protect environment.
A _______ (四月) is the fourth month of a year.
“Help y _________ (自便) to some fish.” Mum said to my friends.