What is difference between comply, observe, obey?

What is difference between regarding, concerning, about, reference

what's difference between them? compete, contest, contend. what's difference between them?

what is difference between them? compensate, recompense, repay, remunerate. what is difference between them?

valentine's day Today is valentine's day. It is the holiday of all loving couples. I saw many pretty girls holding rose with her boyfriend walking on the road on my way home from work. I felt jealousy because I do not have a girlfriend now. How pitiful I am. So God, please give me a girlfriend, please!!!

Introduce myself Hi, I'm Michael and come from China. I want to improve my english and make friends here.