One evening I went out and left my 17-year-old son in charge of his 8-year-old brother and 4-year-old sister. On this occasion, the chore (烦人的事) was made less troublesome by the presence of his girlfriend. I left with complete confidence that the older children would do a wonderful job of babysitting the younger children and the younger children would do a wonderful job of accompanying the older ones. Later, I discovered that complete confidence was the last thing I should have left home with.