根据首字母或所给中文提示，写出正确的单词完成句子。

1. With exams only a week away, I am under a lot of s________.

2. Young people should be physical and ________(精神)health.

3. The forms of poems I liked best conveyed their meaning by using the b________ minimum of words.

4. Our aim is to further s________ the friendship between the two countries.

5. If he had ________ smoking, he would not have got the cancer at his early age.

如图，AD是△ABC的角平分线，EF是AD的垂直平分线． 求证：

（1）∠EAD=∠EDA．

（2）DF∥AC．

（3）∠EAC=∠B．