5. I plan to visit the Jinggang Mountains during the Army's day.
我打算建军节期间游览井冈山。
还能这样说：
I make a decision to travel the Jinggang Mountains during the Army's day.
I will spend the Army's day in visiting the Jinggangshan.
应用解析：
the Chinese People's Liberation Army 中国人民解放军；
a field army 野战军；
army, navy and air force 陆、海、空军
6. The Great Wall left me a deep impression.
长城给我留下了深刻的印象。
还能这样说：
I had a deep impression on the Great Wall.
The Great Wall made a deep impression on me.
谚语：
First impressions are half the battle.
最初的印象最深刻。（先入为主）
7. Niagara Falls comprises three distinct cataracts.
尼来加拉大瀑布由3个大瀑布组成。
还能这样说：
Niagara Falls consists of three distinct cataracts.
Three distinct cataracts form the Niagara Falls.
应用解析：
(as) distinct from 与……不同；
be distinct in...from... 在某方面与……不同
8. The Emperor Qin Shihuang's Tomb was founded in Qin dynasty.
秦始皇陵兵马俑建于秦朝。
还能这样说：
Qin dynasty had built the Emperor Qin Shihuang's Tomb.
The Emperor Qin Shihuang's Tomb was constructed in Qin dynasty.
应用解析：
build on 把……建立在……上；以……为基础；依赖；
build out 扩建；增建；
build over 盖满建筑物；
build round 用建筑物包围