短文选词填空。

Tom has changed a lot．He used to be shy ,but now he is outgoing ．He used to make a lot of trouble．He always wasted his time in the  past．He didn't used to         (1) his problems．He always made some mistakes．He used to be afraid of the dark, but now he is            (2) of being alone．He slowly realizes that he needs to spend more time             (3)．So he made a         (4) to study hard this term．He thinks it's his duty to study．Now he can deal with his problems．He        (5) his problems as challenges．