: accept a lt_____ now that increases in global temperatures are due to human activity. b Most scientists _____ that we need to take action to reduce global warming, not know a We _____ exactly how many stars there are in the solar system. b It _____ exactly how stars were first formed., think a Some researchers _____ that it could be possible to live on Mars. b Mars ____ to have water under its surface., believe a In the past, many diseases _____ to be caused by having too much blood in the body. b Doctors in the past _____ that they could cure diseases by removing blood from the body. ,

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