Here are the filled gaps with suitable words from the box:

1. The **literature** provides a chance for students to bring their personal experiences to the classroom.
2. I love the subject **independent**. It allows me to meet people with similar interests.
3. The author sold more than 50 million copies of in 20 languages by the end of the 21st **century**.
4. My father taught the English language and **serious** at a university in Germany two years ago.
5. There are many **methods** of learning and ways to help students improve their skills.
6. High school students have to **follow** the rules and obey their teachers.
7. University students are more stressed because their exams are **serious**.
8. They have to be more **independent** in the real world.

(Note: some words in the gaps may be repeated as appropriate based on the context of the sentences.)