九、文化交流
好处：
1、cultural exchanges can enhance international friendship.
2、people can acquire better understanding of each other.
3、can also greatly benefit the countries and stimulate their own social development and culture prosperity.

十、繁荣：

thrive/boom/flourish/blossom

十一、人口问题、解决问题：
1、the awareness of struggling for one’s life is essential to the young man
2、parents indulge children in consumption with an objective outlook on money
十二、交通事故
Traffic accidents have long been a problem and are becoming a severe problem
原因：
1、many drivers are forced to drive days and nights
2、a lot of people drive after drinking alcohol
十三、城市发展与历史传承
1、a balanced economic development is not accompanied by sacrifice of history.
2、historical sites are the treasure of our country’s glorious past. We must figure out a win-win method to promote sustainable development while retaining our cultural heritage.