What are the missing letters in these words? F

 What are the missing letters in these words? F

[style]2[/style] [question] [{ 'title': 'What is the missing letter?', 'image':"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAO-yZzptJq7GGkLxwmwDTQNXiMpqlEE9YxBFOjLDNoAM_6Rt7AzA78z_KM5DPKCqQ6BMDQ-pfH0i0p23uJ-tJL0yg9eSLmeECF4UYfMXNo3mskPxcAlKHd22UJ7SeaCPwO7P3xtquoEuHnGy3YY28SHM1gLldt4k9osWPKqLUfwZRO5vD490pb5vv/s600/1.jpg", 'answer': [ "__F", "O", "C", "D" ] }, { 'title': 'What is the missing letter?', 'image':"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhcX_kiwjppwv14EZzStzNfJYGoxwVmMrURCVQFk_cuU6AtB0AX37iAs5tqrflUj8Y3Q6ZVB5Wk0C_1UPGo7MnaR6vP-IlKOBoX3ECZooVXPBLQQHhmC9QUcN3ZW5G1bsXqEOzaHK-zpXBgNA3QX-PibJ2NpT-gzBoNjs5upopTlSeAH6418dxv9QV6/s600/2.jpg", 'answer': [ "E", "__A", "D", "C" ] }, { 'title': 'What is the missing letter?', 'image':"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVEeFqITjsoMENe-Lizmno-VYPrAW5gonNiPEhDN0v5x1-fhZvpUBjemL2EZbQ5IEjYGJamAL6XRRXgd6J2CHzGdkocBpYeTxCPFVNjOtt2jJFnccY4F5fQ6DHTg6HU4aMFmd66R9WfHHVQmQWHGVZiDn_yGIyutLOEGbkNDzLA8lBuZNWaDPx3iGy/s600/3.jpg", 'answer': [ "Y", "A", "__O", "S" ] }, { 'title': 'What is the missing letter?', 'image':"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6IgWbWdkm9sfjnaZD0Bbx1-ue83mrUDf91nYUb4kn0Lo5-m9xjBPBh53B8R9qpps0gGiBG9SEhq-oo1DKYeGDOg-bH-RwOxUcWb81cZu5pWI6J6zRDQWjzS_6iKmfXOESvcpdo_IotB9YCpxdAyH8WValN6MrvaglSo5q0ROz3pUgKx9M8robFckr/s600/4.jpg", 'answer': [ "A", "B", "C", "__D" ] } ] [/question]