trial and error, Scientists spent years of __________ in the laboratory before they finally discovered a vaccine for the virus., chalk and cheese, The two business partners are like __________; one is incredibly adventurous and takes risks, while the other is extremely cautious., back and forth, The committee members debated __________ for hours, but they still couldn't agree on a location for the new city park., first and foremost, __________, we must ensure the safety of the passengers before the train departs from the station., cut and dried, The deal is already __________, so there is no point in trying to negotiate a different price now., by and large, __________, the international conference was a huge success, despite a few minor technical issues with the microphones., touch and go, It was __________ for the hikers when the sudden blizzard hit the mountain, but they safely reached the cabin., black and white, The judge explained that the law is completely __________ in this situation, so there is no room for interpretation., give and take, A successful marriage requires a lot of __________, as both people have to compromise to keep the peace., fits and starts, Construction on the new highway has been moving in __________, mostly because of the unpredictable winter weather., ins and outs, An experienced mechanic knows all the __________ of European car engines., tried and tested, Relying on local community surveys is a __________ method for gathering accurate public feedback.

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