Use of English 5 Choose the correct option, A, B or C to complete the text.

At the end of 2011, six brave 0 were warmly greeted by their friends and family members 1 they got home after one and a half years. Although they spent more than eighteen months on board, they never left the Earth. Actually, they were inside a capsule near Moscow, Russia. The men were part of an 2 to see how the human body and mind react to long periods of isolation. They 3 500 days in conditions similar to those on a trip to Mars. 4 this time they played games, exercised, socialised and did tests. People at mission control 5 their behaviour, as well as the effect that low gravity and less food had on them. Scientists hope that the results of this analysis will help them find a solution to problems common for
space travel.

0 A astronauts B spacecraft C chemicals
1 A until B while C when
2 A evidence B experiment C environment
3 A used to spend B have spent C spent
4 A By B As soon as C During
5 A observed B have observed C observe

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