Achieving a high degree of proficiency in English as a foreign language is not a mysterious _____  without scientific basis.

I bought a dress for only 10 dollars in a sale; it was a real______.

I can’t say which wine is beat—it’s a （n）_____of personal taste.

He was nominated（ 提名……为侯选人）for the best actor____.

4. Hiking by oneself can be fun and good for health. It may also be good for     building.