The survey_____ that approximately 20 percent of teenage Internet users become addicted to, while the parents' judgement of the situation is not so optimistic.
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Maybe it's not that _____ people see things less realistically, but that people who see things realistically have more reasons to feel blue.
Some researchers believed that _____ pressure could make you more attentive, improving your memory and ability to learn.
As the Ebola virus began to _____ Central and West Africa, uncontrolled panic quickly spread to other areas due to high fatality rate.
Although OCD (obsessive-compulsive disorder) is one of the most disabling of psychiatric conditions, it is also one of the most _____.