阅读下面短文,根据短文内容填空。在未给提示词的空白处仅填写1各恰当的单词,在给出提示词的空白处用括号内所给词的正确形式填空。Five Belgian firms plan to send a 3D (print) artificial heart to the International Space Station by ?0?5 to better understand the effects of ageing and heart diseases in space. The device, which is only a few square millimetres in size, (use) ink made up of stem cells and biomaterials that can develop into any cell in the body. These cells organize themselves into a developing cardiac organoid (心脏类器官), will work with the artificial circulatory system. The innovative technique would facilitate (investigate) into heart diseases and trials of some potential medicines.
答案:【1】printed【2】uses【3】which【4】investigation(s)