在下面对话的空白处填入适当的话语，使对话完整（5）
A: You look sad ,Nancy !_
B: I don’t know, Grandma.I feel like doing nothing .
A: Are you ill ?
B: I’m not sure .______ ____
A: Why don’t you want to go to school ?
B:I had an exam last week ,but I failed it.
A: _.You have worked hard ,I know .You were just unlucky. And one exam doesn’t mean all.
B: But I’m afraid my mother and father will ____ me
A: They won’t . All you should do is to keep on working hard .
B: .I will . Believe me
A: Come on ! Try the apple pie I made for you
B:___ ____.That is my favorite .