完形填空。 A true friend is always helpful. I didn't believe it. __ 1 __ one thing happened (发生) to me when I was in Grade 7. Li Jie was one of my classmates. He and I were also neighbors. He always listened to his mother __ 2 __.  I didn't like listening to my mother. I didn't think it was necessary for__ 3 __ to teach me anything. Li Jie knew all about that but he said __ 4 __ to me. One weekend, Li Jie __ 5 __ me to watch a movie. I liked __ 6 __ very much so I went to the cinema (电影院)__ 7 __ him happily. The movie was__ 8 __ the love between a mother and a son. After__ 9 __ it, I began to know how great the love of the mother was. I felt __ 10 __ that I didn't listen to my mother __ 11 __ . I decided to think more about my mother __ 12 __ about myself. After I told that to him, Li Jie smiled and said, 'It's really __ 13 __ for you to watch such a movie. That was a good choice (选择) for both you and me.' Suddenly, I knew __ 14 __ he invited me to watch the movie. Just at that time, I knew a true friend is always__ 15 __ . (     )1.  A. when (     )2.  A. but (     )3.  A. she (     )4.  A. something (     )5.  A. invited (     )6.  A. them (     )7.  A. and (     )8.  A. of (     )9.  A. reading (     )10. A. sorry (     )11. A. again (     )12. A. and (     )13. A. bad (     )14. A. what (     )15. A. helpful B. after B. and B. me B. nothing B. take B. him B. with B. in B. read B. happy B. after B. than B. interesting B. when B. important C. if C. so C. her C. anything C. helped C. movies C. of C. for C. watching C. sad C. before C. or C. exciting C. why C. popular D. until D. or D. us D. everything D. answered D. my mother D. to D. about D. watch D. interested D. while D. with D. necessary D. who D. kind