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Complete the text with appropriate forms (active or passive) of the verbs in brackets.
Slowly but surely the coastline of Britain (1) is being worn away (wear away) by an advancing sea. The country which one ‘ruled the waves’ now (2) (rule) by them, with huge forces threatening to destroy vast areas of human and wildlife habitat. Already some of Britain’s last wild, natural areas (3) (disappear), and experts (4) (fear) that this is just the beginning. It (5) (estimate) that there will be a 38-55 cm rise in average sea levels by the year 2100. According to the Department of the Environment, during the next 50 years at least 10000 hectares of farmland (6) (turn into) mud flats and salt marshes by the increases in sea levels. Rather than trying to prevent the erosion, the present governt (7) (use) a method of ‘managed retreat’ by creating new defences further inland and allowing low-lying coastal farmlands (8) (abandon) to the sea. However, many of the country’s major cities could also (9) (affect). London, Bristol and Cardiff all (10) (expect) severe flooding as our sea defences (11) (destroy) by the rising tides.