Some regrets of mine

In the past year, I went through lots of happy things, but I also have some regrets. So, sometime I really want to I would go back and redo something which I regret,
Sometimes, I wish I were a freshman, I would have took more concerned about my courses. Particularly Modern Chinese. Although this course is pretty boring, but it could make ne analyze Chinese clearer. I could have got every knowledge points from my professor.
I also would have joined more extra-school activities. Several times my friends invited me to joined an extra-school activitiy, I reject them, for a variety of reasons. I should have followed them to joined those activities. I think if I did that, I could have got more experiences and wonderful memories.
And I would have went to see my old house once more. Last month that house was demolished. I spent my childhoud there, there have a lot of my memories. I should have went there before I came to United States, and I could have took some photos as souvenir.