题目

请根据句意从方框中选择合适的单词，并用其适当形式填空。Quick fifty certain fog we【1】In his ________,he began to learn to play the piano.【2】It has become much ________than before because of air pollution.【3】Something is wrong with my bike,but I am ________if l can fix it by myself.【4】We all think you are really a good friend of ________.【5】Please get yourself ready as ________ as possible.The bus is coming.17．Lily goes to school ______ bus every day．（　　）A．onB．atC．byD．in