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. h

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