10e
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Suggested key
1. Njau, a Kenyan immigrant in Britain, earns his living as a customs officer at the airport.
2. He especially observes/monitors those who are nervous and (seem to) panic easily.
3. Njau is well-mannered and always thanks people for their co-operation.
4. Yesterday morning he was heading for the customs hall when he realized something.
5. This job was a chance of a lifetime for Njau.