Chọn từ phù hợp nhất để điền vào chỗ trống trong đoạn văn sau

It's estimated that about three billion people use the Internet computer network around the world. Most people use the Internet to get information and for entertainment. ___(1)___, a new study shows us that almost 10% of Internet users are using it so often that it is seriously ___(2)___ their lives. The study says that these people may ___(3)___ it difficult to stop using the Internet because they have become addicted. According to a psychologist in the field, 30% of Internet users say that they use the Internet ___(4)___ from problems or emotions. The study also shows that having a chat or discussion with strangers ___(5)___ the Internet is one of the most addictive activities.