 Cloze Test
Choose the most suitable word:
At the end of the 19th century, the American astronomer Percival Lowell thought he saw canals on the Red Planet.He was 1.(persuaded,covinced,convicted,assured) that they were part of a planetwide irrigation system, built by a(n) 2.(progressive,advanced,mature,evolved) Martian civilization.His idea was popularized by the author H.G. Wells in his novel War of the Worlds(1898), in which sponge-like creatured from the Red Planet tried to take 3.(up,on,upon,over) the Earth.By the time 1950s, the sponges, and the little green men were gone forever.Astronomers saw through their telescopes a harsh, featureless world, but one which they believed might still 4.(uphold,nourish,support,lead) primitive life.The strongest evidence in support of the hypothesis about life on Mars comes from the study of microbes here on Earth.Scientists are finding microbes on conditions remarkably similar to those on Mars.These organisms, called hyperthermophiles, can live and 5.(generate,increase,multuply,produce) without oxygen or light in 6.(exuberant,uttermost,extreme,utmost) temperatures, using only rocks and water to sustain themselves.Scientists believe that 3.8 billion years ago, when primitive organisms were spreading through our oceans, Mars would have been much warmer and wetter than it's today, with an atmosphere just like that of the Earth at the time.Under these conditions, it's highky probable that life may 7.(arisen,aroused,roused,raised) on Mars as well.Life forms could have been tranferred between the earth and Mars in debris created by the impact of comets and asteroids on the surface of the two planets.About 500 tonnes of material from Mars land on Earth every year.In 1911, a piece of Martian rock 8.(crashed,crushed,slashed,clashed) in Egypt, killing a dog.It's in these chunks of rok that life forms could have been trabsported from planet to planet.Now,astronomers say they have found the strongest 9.(marks,tracks,indication,source) yet that there could be life elsewhere in the Universe.They say they've found 2 planets orbiting other stars in the Galaxy where liquid water could exist,raising the hopes that life could survive there.On the other hand,no one yet knows what the planets are actually made of, which may affect their 10.(expectation,outlook,perspective,chance) of sustaing life.
My answers:1-convinced;2-mature;3-over;4-support;5-multiply;6-extreme;7-arise;8-crashed;9-indication;10-chance  | 
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