完形填空。 A door was locked. A big stone came and hit the door. But he couldn't 1 it. Later a key came. He 2 the lock and the door opened. The stone was very 3 that the key could open it so easily. He asked the key: ' 4 did you do that?' The key 5 him and said: 'Because I understand its 6 .' Life is just like this. 7 we want to solve a problem, we must understand it 8 . If we want to make friends with people we must understand 9 . If we want our parents to 10 us, we must first know their hearts. We must know what they hope for. (     )1. A.touch (     )2. A.got out (     )3. A.worried (     )4. A.Why (     )5. A.smiled to (     )6. A.problem (     )7. A.If (     )8. A.first (     )9. A.us (     )10. A.love B.open B.got to B.thankful B.How B.talked about B.work B.Because B.later B.others B.understand C.reach C.got in C.surprised C.When C.agreed with C.heart C.Although C.finally C.them C.remember