题目内容：
提示：爱丽丝的妈妈病了，爱丽丝想向老师格林先生请几天假。
Alice:Excuse me.Mr.Green.I′d like to take a few days off.
Green:51?
Alice:My mother is ill.I have to take care of her.
Green:Oh dear!I am sorry to hear that.52？
Alice:No.thank you.My mother has caught a bad cold.She has a high fever and coughs day and night.The doctor says my mother has to be in hospital for a few days.I would like to be with her.
Green:I understand.53？
Alice:I hope to be back next Wednesday.
Green:That′s all right.54
Alice:Thank you,Mr.Green.That′s very kind of you.I will write it immediately.
Green:55
第54题答案是
答案解析：