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。

小题1: It is i_________ (重要的) for you to keep healthy.

小题2:He r __________ (收到了) a story-book on his last birthday.

小题3:We shouldn’t throw rubbish e ________ (到处) to protect environment.

小题4:A _______ (四月) is the fourth month of a year.

小题5:“Help y _________ (自便) to some fish.” Mum said to my friends.