单词拼写（共5小题；每小题1分，满分5分）
根据句意和首字母或汉语提示，将单词的正确形式写在题中相应的横线上。
Do you know the Four Great I____________ of Ancient China?
In g__________, he can get along well with his classmates.
The old man's sudden_______（死亡）made all his children very sad.
In this book, you will find out how to s_______these difficult problems.
How to protect ourselves should be ___________(教) at school.