7. Use appropriate sentence connectors in the blank spaces of the following text. Scientists have always wondered (a) - there is life anywhere out in the space. They have joined together in a major project called the communication with Extra Terrestrial Intelligence (b) - seeks to establish contact with any other living beings in the universe. (c) - , they are beaming out radio signals into the space. It was thought (d) - there exists life on Mars. (e) - two viking spacecrafts (f) - landed on Mars in 1976 did not provide much evidence of life there. The pictures sent by them showed (g) - the Mars has a sky; (h) - , the sky is red instead of a blue one like ours. Its gravity is about half (i) - strong (j) - that of Earth. (k) - , the atmosphere is also much thinner than that of our planet. It has deserts, high mountains, canals, volcanoes, craters etc. as well as summer (1) - winter. (m) - , there are no trees, (n) - life forms.

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