9. Paris is a modern city with a long and rich history.
巴黎是一个历史悠久的现代都市。
还能这样说：
Paris is a modern city which has a long and rich history.
As a modern city, Paris has a long and rich history.
谚语：
History repeats itself.
历史往往重演。
10. Whenever I visit the Sun Yat-sen Mausoleum, I will remember Sun Zhongshan's heroic deeds.
每当游览中山陵，我就会想起孙中山先生的英雄事迹。
还能这样说：
I will remember Sun Zhongshan's heroic deeds whenever I pay a visit to the Sun Yat-sen Mausoleum.
I will call back Sun Zhongshan's heroic deeds when I pay a visit to the Sun Yat-sen Mausoleum.
应用解析：
do the deed 产生效果；
in deed and not in name 在事实上而不在名义上
11. I can learn the national culture from visiting the places of interests.
游览名胜古迹可以学习民族文化知识。
还能这样说：
I can acknowledge some national culture when I pay a visit to the places of interests.
I can know something about the ethnic culture when visiting the places of interests.
12. There are many historic interests in Beijing.
北京有很多名胜古迹。
还能这样说：
Beijing has many historic interests.
There exist lots of historic interests in Beijing.