Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks.

It is estimated that about three billion people use the Internet computer network around the world. Most people use the Internet to (1) _______ information or for entertainment. A new study, however, shows us that almost 10% of Internet users are using it so often that it is seriously harming their lives. The study (2) _______ that these people may find it difficult to stop using the Internet because they have become addicted. Someone who is addicted finds it extremely difficult to stop (3) _______ activity. According to a psychologist in the field, 30% of Internet users claim that they use the Internet to escape from (4) _______ or emotions. The study also shows that having a chat or discussion with strangers on the Internet is one of the most (5) _______ activities.