complete el siguiente pasaje usando los verbos que están en la caja en tiempo pasado. Habrá un verbo extra.
arrive - help - learn - think - hit - appear
Water is an essential part of our planet. Without water, no life would be possible. We all ________________ about the water formula and its cycle in nature. We have also seen how much water there is in the oceans on maps, but... do we know how ________________ water on our planet? One of the most known theories says that water _________ in our planet because asteroids and comets have water in them in the form of ice. In the Pre-Cambrian era, thousands of meteorites __ the surface of Earth, causing great destruction. The water stayed on our surface and create life. Another theory claims that water existed on Earth from the beginning. Scientists have discovered some asteroids as old as our planet and found evidence of water in them. According to some experts, water could have appeared before we even ___________ .
arrive - help - learn - think - hit - appear
Water is an essential part of our planet. Without water, no life would be possible. We all ________________ about the water formula and its cycle in nature. We have also seen how much water there is in the oceans on maps, but... do we know how ________________ water on our planet? One of the most known theories says that water _________ in our planet because asteroids and comets have water in them in the form of ice. In the Pre-Cambrian era, thousands of meteorites __ the surface of Earth, causing great destruction. The water stayed on our surface and create life. Another theory claims that water existed on Earth from the beginning. Scientists have discovered some asteroids as old as our planet and found evidence of water in them. According to some experts, water could have appeared before we even ___________ .
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