Completar frases SIA 8 Unit 10Versión en línea Vocab por Jennifer Quirós 1 possibility civilization uncertain suggestions wondered speculate theories knowledge doubt 1 . Our of how the brain works is still limited . 2 . They made some helpful about how to solve the problem . 3 . There are many about what causes food allergies , but that's all they are . 4 . Disease may have been a factor in the fall of the Aztec in Mexico . 5 . There is a strong that this new treatment will work . 6 . This handwritten document is very precious and ancient , but nobody knows what it says . 7 . It was a difficult decision , and they what to do for a long time . 8 . There is no that he stole it because he was caught on camera . 9 . Until we know all the facts , we can only . 10 . The origin of the mysterious object is still .
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