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.

划分东西半球的界线是

A、赤道

B、北回归线

C、20°W和160°E

D、本初子午线