Susan: I’m so glad to see you, David．     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     that we would meet on the plane．
Susan: I’m afraid I haven’t had time to look at     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      friends．
David: I can imagine．My English has gotten not so fluent since I returned from the States,     I’m rather nervous myself．But I saw that you     （give） the most important talk at the conference．
Susan:     （frank） speaking, I’m scared to death about it．
David: I’m just giving a talk in one of the workshop sections, and I hope I won’t make all of you     （disappoint）．
Susan: But your English is much     （good） than mine．
David: But you’re now the Director of the Air Quality Institute, so you     know the technical terms．
Susan: Maybe．But I still can’t understand totally a lot of technical terms in my field．