Complete the text with the correct word.
Don't stand so close to me
Researchers at the department of neuroscience at University College London 1………….(studied/have been studying/have studied) the limits of personal space. This is the area around a person which determines whether he or she is comfortable with the closeness of another person or whether the distance is causing them to feel 2…………...(on edge/at edge/in edge). Fifteen volunteers aged between twenty and thirty-seven chose 3………………(to take part/taking part/take part) in the study, which involved receiving an electric shock to the hand. The volunteers 4……………(should/must/had to) hold their hands at different distances from their face in order to receive the shock, and their reaction to it was measured by the scientists. The measurements were taken from the volunteers’ eye movements, and in particular, how often they blinked. The more they blinked, 5………….(more/the most/the more) of a threat they felt the shock was to their face. The scientists 6……………(found/had found/had been finding) that the personal space of the volunteers appeared to have an abrupt boundary when they felt threatened, rather than having a gradual increase. The boundary varied among individuals, but it was generally between twenty and forty centimetres from their face. A spokesperson from the university said it is possible that the findings 7………………..(could/must/can't) be useful for helping police and other emergency personnel to assess threats 8……………(more accurately/the most accurately/most accurately).
Personal space is thought to be a cultural issue because it is seen as being 9…………….(most/less/least) important in other countries, such as China and India. The spokesperson said researchers hoped to study subjects from other countries soon to understand 10……………….(better/well/best) the differences between cultures.

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