Thank you so much for all these valuable suggestions . By now ,I do just as the teacher told me to do,and I will definitely add more of my own interpretations later. But that will be when I play more works of Beethoven ,I think. By now ,if I add my own stuff, I am afraid to make the whole picture too"romantic"for beethoven. But I will begin the legato phrases u mentioned.
Could you by the way listen to the other two movement that I posted if you have some time ,and give me your advice.Thanks at first.