英语1.i'm not () today .i think i need to go to see the doctor

英语1.i'm not () today .i think i need to go to see the doctor.
答案是填myself.请问为会么要这样填?怎样译这个句子?
2..of the two toys ,the child chose () A the expensive one B one most expensive C a least expensive D the most expensive one请问表达两个之中最不是要用the +比较级+ 这里好像没有答案是对的?