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Giants OF THE SKY

You would certainly notice one of these if it was flying above you! They're called airships and 1)... their enormous size, they float effortlessly among the clouds. Once known as zeppelins, these strange-looking aircrafts first took to the skies in the early 20th century but, due to a number of high profile accidents, they soon disappeared. Recently, however, airships have 2)... a comeback with new technology that makes them much water as well as more energy-efficient. Most new airships can also travel further distances and carry heavier loads than previous models. With 3)... speeds of 185 kilometres an hour, airships are still much slower than aeroplanes, but they require only a third of as much fuel. And unlike aeroplanes, they can take off and land vertically, 4)... like a helicopter. This means that they can be very useful when large groups of people need to travel to destinations without an airport. In fact, in the last few years, airships 5)... for military missions and scientific explorations. With the world on the verge of an energy crisis, given its low fuel-usage, airships could become one of the most popular modes of transport in the future.

1. A. even though  B. despite  C. although
2. A. had  B. done  C made
3. A. average  B. ordinary  C. standard
4. A. right  B. just  C exact
5. A. are used  B. are being used  C. have been used