breakthrough, Scientists described the discovery as a major ______ in medical research., underlying, We still don’t know the ______ cause of the sudden equipment failure., root, The team is trying to get to the ______ of the problem before restarting the experiment., extract, The lab technician managed to ______ a tiny sample from the tissue., insert, The surgeon carefully ______ the device into the artery., stuck, We were completely ______ on the motorway because of an accident., thin end of the wedge, Many experts warn that approving this law is just the ______ and could lead to stricter rules., slippery slope, Changing this safety protocol could put the organisation on a dangerous ______., undertake, The research group will ______ a full investigation next month., lead to, A lack of proper planning can ______ delays and unexpected risks., conditions, The trial must be repeated under identical ______ to confirm the results., duplicate, No other lab has been able to ______ the findings so far., due, The report states that the failure was ______ to contaminated materials., down to, The improvement in test scores was mainly ______ better teaching methods., adverse, The medicine was withdrawn after causing several ______ effects in patients..

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