There is no _____ that the Chinese people will present to the world a successful, splendid  and unforgettable exposition（博览会）.

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

Giving up my job to go back to full-time education was a big __________, but now I know it was the best decision I ever made. 

This map is drawn to the _______ of one inch for 1000 miles, so you can find out how far it is from Beijing to Shanghai.

 His new appointment takes _____ from the beginning of next month.