1 . ______________________ , you should examine yourself and see if there is something wrong with your personality.
作为一个青少年，你应该全神贯注于学习。(concentrate)

2 . ________________ my autobiography.
我正在集中精力写我的自传。

3 . 当有很多事情要考虑时，你很难集中注意力。(it, concentrate)
________________when there are many things __________.