33. Many American teenagers have part-time jobs to gain work experience and learn how to manage their money. 34. A university degree will help graduates have broader career options and an advantage in the job market. 35. Preserving heritage sites can present a challenge, especially if they have to many nations. Mistakes in each sentence: 36. I remembered having visited the historic site, but I didn't remember exactly the time. (Change "visit" to "visited") 37. It was in 1993 that The Complex of Hue Monuments was recognized as a World Heritage Site by UNESCO. (Add "in" before 1993) 38. His proposal was very interesting; however, it was rejected because of a lack of money. (Change "Moreover" to "however" and add "a" before lack) 39. Because of poor wildlife management, many rare species in the national park may not survive. (Add "of" after poor) 40. The best way to help prevent bullying is to build your self-confidence. (Remove the apostrophe from "self's") I hope this helps! Let me know if you need further assistance with anything else!