The rate of racial progress varies in different areas of the country, but in the past ten years _________ more improvement

下列词语中加点的字，每对读音都不相同的一组是（　）

Howcan you expect the children to behave themselves _____ you yourself don’t mindyour manners

It will be ________ next week and there will also be a lot of ______.

He started to study ecology and decided to _______his whole life to the science.