1. I have come to be interested in Chinese __________(文学) recently since I read several famous Chinese novels.
2. Accepting this job is a bit __________ (挑战性的)for me, because it needs great patience and much experience.
3. In China many students are forced by their parents to be given __________ (额外的)lessons after school like art lessons.
4. I have never __________ (经历) such a painful feeling in my life.
