say" nothing "when across my primary teacher

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I miss my primary teacher, who's teacher "zhang "she treat me very well when i am a small girl ,and when i get up i also remeber her ,and i want to meet her oneday, but yestoday i really meet she but at last i have to say nothing to she , even i just take that i haven't saw she .at this moment i think is not the best time to talk to she .if you what will you do ?