2. (i) plummeted
3. The 1980s were a time of great economic prosperity./There was an economic boom in the 1980s./People had a lot of money in the 1980s.
4. China/the mainland
5. the vast majority of her fan base is from the mainland
6. (i) NG
7. The more times their songs are streamed online, the more revenue they will get back.
8. talent drain