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根据中文提示,把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:Lucy要去艺术展览中心,向一位男士问路，该男士告诉她如何前往。

(L=Lucy;S=Sir)

L: Excuse me ,sir.      51       the Art Exhibition Centre?

S: Yes but it is quite far.It'S about an hour'Swalk.You can take a bus there.

L:           52       ?

S: You can take Bus No. 15.

L:           53         ?

S: About 20 minutes. And you can also take a taxi.

L: Taxi? That'S a good idea. Thank you very much.

S:     54             .

L: Goodbye.

S;       55       . 

What problem did Maria meet with in winning the prize? 

• A、She named the comet on her own 

• B、She did not use the required telescope. 

• C、She did not report her discovery in time 

• D、She discovered the comet with her father 

32

• A、neither 

• B、none 

• C、either 

• D、 no