1) After watching the documentary about ancient aliens, Mark was ________ the theories presented as facts. He didn't believe everything they said. a) skeptical about b) highly unlikely c) not entirely sold on d) having second thoughts 2) The scientist said it was ________ that the strange signal came from another galaxy. The chances were almost 0. a) debatable   b) highly unlikely  c) casting doubt on d) skeptical about 3) Despite the excitement in the online forum, she was ________ about the latest UFO sighting being genuine. She was a rational person and needed more details. a) having second thoughts b) skeptical about c) casting doubt on d) not entirely sold on 4) The photo of the crop circles led many to start________ their previous disbelief in such phenomena. a) casting doubt on b) debatable c) not entirely sold on d) having second thoughts about 5) Everyone in the chat was arguing whether the ghost video was real, making it ________. a) debatable b) highly unlikely c) not entirely sold on d) casting doubt on

Expressing doubt

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