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TASK 23. Use the correct conjunction or preposition. Choose from the box below and repeat as many times as you need.
that to with at of on for in by
***TASK 24. Use the best suitable word in each gap.
****TASK 25. Revision: adjectives and adverbs. Use the best suitable word in each gap.
Whether or not we are __________ (1) in the universe is a question that has vexed humankind for centuries. But we are __________ (2) to live in an era when the technology exists to allow us to come __________ (3) to giving an answer. Up to now, __________ (4) only was a belief in the existence of extraterrestrial life often __________ (5) on personal rather than religious conviction, __________ (6) was perhaps __________ (7) much based on faith. But scientifically the possibility cannot be discounted and, perhaps more __________ (8) at any other time in history, the subject is no longer liable __________ (9) be dismissed as a crank's discipline. For example, can we estimate the number of civilisations within our own Milky Way galaxy? These days scientists believe that in some __________ (10) they now have a not __________ (11) knowledge of the factors involved in producing such civilisations. The rate of formation of suitable stars – that is, ones __________ (12) Earth which are hot __________ (13) to sustain life and live long enough to allow life to evolve – is a __________ (14) starting point. Astronomers are confident __________ (15) they can assess this rate of formation at .......... (16) one star per year. However, these stars also need to have habitable planets. __________ (17) in the last five years have scientists found evidence that at least some stars (other than our own star, the sun) have planetary systems. Broadly __________ (18), perhaps one in ten stars have planets orbiting them. But we also require that these planets are warm enough to have liquid water, a basic component integral __________ (19) life on Earth and presumably life elsewhere, and are not lacking __________ (20) an atmosphere that can both provide protection and sustenance to developing life.
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Ббк 53. 57Gray. Venus on fi re, Mars on ice balance — the key to life, love, and energy© 2010 Mind Publishing Inc published in the...