单项选择题

The relationship between parents and children is very important, (21) with their mothers. Yet, some mothers don’t care (22) their children and don’t pay attention to them. The cause of this problem is that the mothers are busy (23) . First, children need their mother’s love. Second, they want to have a mother who (24) them study. (25) , the mother works all the day outside. At night she is very (26) and she falls (27) quickly. Children want more time to enjoy their childhood; if they don’t, they will have dangerous habits such as smoking and drinking (28) may make them fail in the exams. (29) nice it is to have a non-working mum ! It’s a great pity (30) a working one.

A. tire B. tiring C. tired