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(a) whether/if; (b) which; (c) so; (d) that; (e) But; (f) that/which; (g) that; (h) however; (i) as; (j) as; (k) Besides; (l) and; (m) Moreover; (n) let alone

Scientists have always wondered (a)  whether/if there is life anywhere out in the space. They have joined together in a major project called the communication with Extra Terrestrial Intelligence (b)  which seeks to establish contact with any other living beings in the universe. (c) so , they are beaming out radio signals into the space. It was thought (d) that there exists life on Mars. (e)But two viking spacecrafts (f) that/which landed on Mars in 1976 did not provide much evidence of life there. The pictures sent by them showed (g)  that the Mars has a sky; (h) however , the sky is red instead of a blue one like ours. Its gravity is about half (i) as strong (j) as that of Earth. (k) Besides , the atmosphere is also much thinner than our planet. It has deserts, high mountains, canals, volcanoes, craters etc. as well as summer (l) and winter. (m) Moreover , there are no trees, (n) let alone life forms.

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