It is widely accepted reported in the western media that the drug ______ is now becoming a leading cause of teenager crimes.

Young people use more Web language in their conversations, such as “Geili” because such language gives them a sense of ________.

 Those black clouds are a sure _____ that it’s going to rain. 

The British government often says that providing children with      to the information superhighway is of great importance.

Pigeon is often considered a（n）________ of peace.