[单项选择]Joe was driving along a main road late one night. Suddenly (41) became wrong with his car wheel (轮胎). He did not know (42) to do and, worse still, he did not have a (43) wheel with him! Joe (44) to passing cars, but not even one of them stopped. At last, he tried a car just (45) his own. To his surprise, the car stopped and a young (46) got out. Joe felt hopeless (47) he didn’t think she could help him. The lady, (48) gave him her own spare wheel, but Joe had to say that he had never changed a wheel in his life! She began to work (49) and fitted (安装) the wheel (50) a few minutes.