And I never read the text twice,even never go through the text and I only notify some special sentences which are related to the questions below. Now I know it's not a right way to do this kind of excercise.
Thanks again for helping me.
I did the same thing before. I only skimmed the text and paid attention to what I was asked to answer. You can try to eliminate this habit by reading short stories, novels, or anything that is in your level. Take your time and you'll be improved since you don't have to force yourself to answer something.