The climate has changed too much and too quickly: This is why wild animal ___________ is becoming more and more difficult every year.
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If you live in India or West Africa, where there is a long ________ of speaking English, you would tend to acquire a variety of pronunciation.
In regard to the development of moral standards in the growing child, ________ is very important when parents teach their children.
Just as most people have realized, jogging is a cheap, quick and ___________ way to maintain physical fitness.
They built huge houses in the 17th century in Moscow _____________________(用传统的俄国建筑风格).