-On hearing the sound, the birds flew away in every    .

Less than ten percent of the employees in their company are women. That is to say, women are in the______.

Hard work is no ____ of an excellent school report record.Your have to adopt a    flexible approach to your learning.

People who get less than six hours of sleep per night have an increased _____ of dying early．

In the time of social reform, people’s state of mind tends to keep       with the rapid change of society.