7．dating　poor working conditions 和 date 之间是主谓关系，因此用动词的­ing形式。

　　8．to support　此处用动词不定式做目的状语。

　　9．is celebrated　句子主语memory 和动词celebrate 之间是动宾关系，主语是单数形式，时间状语是Today，因此用一般现在时的被动语态。

　　10．an　句中的unofficial “National Day”是泛指，故在unofficial 前加不定冠词an。

　　Passage 12

　　(2017·吉林二模)

　　Susan：I'm so glad to see you, David.__1__has been such a long time. How are you?

　　David：I'm fine, and you?

　　Susan：I'm just wonderful. God, time goes by so quickly! Are you going to the air quality conference in Chicago?

　　David：I am. And I'm really glad to see you. Just last night I found your name in the conference materials，but it didn't come to my__2__that we would meet on the plane.

　　Susan：I'm afraid I haven't had time to look at__3__conference materials very carefully. I had no idea you were coming, but I am certainly glad to see you. I was feeling very nervous about going there__4__friends.

　　David：I can imagine. My English has gotten not so fluent since I returned from the United States，__5__I'm rather nervous myself. But I saw that you__6__(give) the most important talk at the conference.

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