1) We will never find life on other planets _______ we look for it a) just in case b) unless  c) since d) as long as 2) We need to be careful about aliens encounters _______ They´re aggressive  a) provided that b) as long as c) since d) in case  3) We could learn a lot from an alien culture, __________ we could understand each other. a) since b) as long as c) in case d) provided that 4) We need to be ready _________ an asteroid or comet is heading toward the Earth a) provided that b) since c) just in case d) unless 5) Any message from the stars could take years to reach us _________ they´re so far away a) since b) provided that c) unless d) as long as 6) The space program will continue __________ there is enough money for it . a) Because b) And c) So d) Or

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