Sentence completion Complete the sentences below.Write NO MORE THAN TWO WORDS

The greatest potential for Hoverplane is as a ferry, travelling between one and two metres above the water at up to 250 kilometres per hour. Its advantages are those of safety and efficiency -safety as it avoids hitting floating or submerged debris and efficiency as it can travel at five times the speed, but at one fifth of the fuel cost of a normal ferry. And plans are being drawn up for a large version, big enough to carry 150 passengers and freight for 2,000 kilometres at over 300 kilometres per hour. Since the Hoverplane can carry a 50% greater payload than a similar sized aircraft, but with a 30% lower fuel consumption, and it needs neither special ports nor runways, the craft should be an attractive economic proposition for operators and promises to be a popular ferry in the 21st century.