47. My mother _______ dinner at home because she _______ to care for my grandma in the hospital last evening. A. didn't eat/ had B. ate/ had C. hasn't eaten/ had D. has eaten/ has 48. He_______ his aunt since he_______ a little child. She_______ to the mountains and_______ as a teacher many years ago. A. hasn't met/ was/ has gone/ volunteered B. didn't meet/ was/ hasn't gone/ didn't volunteered C. hasn't met/ was/ went/ volunteered D. didn't meet/ wasn't/ worked/ volunteered 49. She_______ public transport to work for ages because it helps to reduce air pollution. A. hasn't chosen B. didn't choose C. chose D. has chosen 50. I_______ some food and drink for their new charitable centre yesterday. They_______ a lot of cheap meals for the poor for two months. A. have provided/ have cooked B. provided/ have cooked