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

The selfless village doctor treated whoever came to his family without any       .

Shanghai has become a (n) ________ of the world’s attention with the 2010 Expo being held at the moment.

Bill was doing a lot of physical exercise to build up his______.

Burning all the lights in the classroom will be a great______ on electric power.