填空题
根据中文提示，将对话中缺少的内容写在线上。这些句子必须符合英语表达习惯。打句号的地方，用陈述句；打问号的地方，用疑问句。
提示：在一次Mary举行的生日晚会上，她的女朋友Linda见到了Mary的表弟Steve。她想结识他。Mary给他们做了介绍。
Linda: Happy birthday, Mary!
Mary: {{U}}(51) {{/U}}
Linda:
Who is the tall man next to your brother?
Mary: Didn't you meet him
before?
Linda:{{U}} (52) {{/U}}
Mary: Oh! Then let me introduce
you to him now, Steve,{{U}} (53) {{/U}}.
Steve: Hi, Linda.{{U}}
(54) {{/U}}
Linda: I'm glad to meet you, too. Can't we sit down
somewhere and talk?
Steve: {{U}}(55) {{/U}} Let's sit over
there.