________new organs is not yet possible。, Growing, Grow, Grew, The scientists enjoy ___________., to experiment, experimenting, expertimentting, ____________ doesn't always work well., Transplant organs, Transplat organing, Transplating organs, __________ takes a lot of work., Improve medicine, Improved medicine, Improving medicine, Let's stop ______., breath catcher, catching our breaths, to catch our breath, Stop ________ that medicine and switch to the new one., take, taking, took, The workers haven't been careful when __________., laboratory they did build, building the laboratory, to building the laboratory, _____________________ always seems so difficult., Find my glasses after waking up, Finding my glasses after wake up, Finding my glasses after waking up

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