insist on,keep up,carry out,stick to这几个词怎么区分?

题目

insist on,keep up,carry out,stick to这几个词怎么区分?
No matter what you say,I shall stick to my own opinion.
为什么这题选stick to?

答案

stick to 在此作“坚持”解
insist on +doing
keep up +doing
carry out好象也是坚持的意思
但是从语意上来说Stick To会准确点