题目内容：
提示：Jack去图书馆借书，但没有借书证(1ibrary card)。图书管理员Linda为他办理了借书证，并告诉他每本书可借两个星期，如果需要，可以续借。
Linda: Good morning. 51 ？
Jack: Yes, I want to borrow a book.
Linda: 52 ？
Jack: No, I don′ t have one now. 53 ？
Linda: Well, please fill in this form first.
Jack: OK. ( A few minutes later. )Here′s the completed form.
Linda: Thanks. The card will be ready in thirty minutes, and you can take it later.
Jack :Thank you. By the way, 54 ？
Linda: Well, two weeks. But then, you can renew the book if you still need it.
Jack: I see. Thanks a lot.
Linda : 55
第（51）题答案
答案解析：