For each question, pick up word/phrase from the options to complete the passage : Global strategies to control '..............' disease have historically included the erection of barriers to international travel and '...........'. Keeping people with such deadly diseases outside national borders has '...........' as an important public health policy in the Human Immunodeficiency Virus(HIV) epidemic. Between 29 and 50 countries '..........' to have introduced border restrictions on HIV positive foreigners, usually those planning an '..............' stay in the country, such as students, workers, or seamen.