Use appropriate forms of the verbs given to complete this text. In each case, decide whether an active or passive form is needed.

Date: 2015-10-07; view: 1839.

Slowly but surely the coastline of Britain (1) is being worn away (wear away) by an advancing sea. The country which once ‘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 level by the year 2100. According to the Department of the Environment, during the next 50 years at least 10.000 hectares of farmland (6)…………..... (turn into) mud flats and salt marshes by the increase in sea levels. Rather than trying to prevent the erosion, the present government (7)………….. (use) a method of ‘managed retreat' by creating new defences further inland and allowing low-lying coastal farm land (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.