What are the missing letters in these words? K

What are the missing letters in these words? K

[style]2[/style] [question] [{ 'title': 'What is the missing letter?', 'image':"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgLlhc0X01oEfRD438ejWqLAW4i6COcITDm9Rpkvc_GqTkacSRydsGY96hGj5LAQaOpFTpGFX8Om4d8PoJgjILu-kZHiPTOPmIxHL17Pi5AATvwGwUu2ggTw0n2IEKK5ZRZEAo2VYYiIN3L1__3sPgI-o5eWFb1WhbNc_GLxQ0lfM1OzbWb5p_xk697/s600/1.jpg", 'answer': [ "__K", "T", "E", "N" ] }, { 'title': 'What is the missing letter?', 'image':"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjH_WZf4z-eEAXFHioVBr1WKvx2iEqYlVQgir2JUaMY6QM8pNlWPInQg5onnSe-Y5afkJzdMfin37FvTgWxsgO7ZkB_OYHiJJGsB1Ib79D7lkoLeGvggOBFmcVwZFHhNTPSgDGOa1iJl29vNnH2KXXr_NWz5eqB1GlHwj_9F0zbO_kB4O-vLjvkFNVO/s600/2.jpg", 'answer': [ "A", "__K", "E", "C" ] }, { 'title': 'What is the missing letter?', 'image':"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhcYoEz1MPENy1sMEf1IhVBnnjMQkiBcfDrGbmuTq2TXJLKz33OWXXyK2P0Fc6NUAgQkbg7lmdRtVcS0wmKkzQKQQnHerMKe_93jm48GXtF_Lr1mdo7Xv9oWWI0pk7RA3c7WGYTYDC-IACPcnljMboL2KdMILClM-GPgBhuj82A4Hd8vxvEKxi8eG5h/s600/3.jpg", 'answer': [ "E", "A", "__I", "F" ] }, { 'title': 'What is the missing letter?', 'image':"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihl6o3-Gd_7VD3WuqOOYX5Ms4iLbbH0LXHtcmeM-m2PXAfw9uGmrUeEr7fWFVDbY1wlCRoM9btZySGE8_l_yMxxL0ITXljTRB6P0tn7gRMywh3gc3ClInqZByV7wI0VvjL-VWxM5q0wBPNBsQ8TFejbJrz_vXcVbLa-pbvw_Fgm9_IYZ9pe8e7Kv2P/s600/4.jpg", 'answer': [ "A", "F", "S", "__O" ] } ] [/question]