After a long day of hard work, my only     is to get back home and have a good sleep. 

Global warming caused by human being’s casual behaviour has become a major _______ for people all over the world.

In rencent years, China and the USA have been a lot of_____of views about the same problem. 

The teacher suggested we do the exercises with great ________ though they were easy.

Microsoft has been in the leading _____ in the software industry for years.