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Helicopters have one distinct difference (l) …………all other vehicles, itis (2) ……….. they can fly vertically. Helicopters can fly (3)…………… junglesand forests, hills and mourrltuins, and they can take off or (4) ………… almosteverywhere. Because of this, they have been especially (5) …………. to explorers'In the jungtes of South .Ameriqa, heliqopters have helped explorers inlooking (6) …………… new places to drill oil wells. They are used to bring in veryheavy drilling equipment and anything that may be (7) ……………….Big helicopters can lift loads up to ten tons. They can go anywhere andhover over a chosen spot. This (8) ……………….helicopters excellent flying cranesHelicopters have rescued (9) ………………from the seas and mountains. As they getmore efficient, they will be found to be more and (10)


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