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

. It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.

In order to prevent people spreading rumours through the Internet, the government decided to place ______ on the freedom of spreading news on line.

 Many people consider it _________, from which a lot of children benefit.

England is rather short of arable land , so it is absolutely dependent upon other countries for her food __________．