The __（thank）mother didn't know what to say

The __（thank）mother didn't know what to say __________at the news that I didn"t know what to say to comf I didn't know what there was to say regardless. i didn't know what should say to my teacher Tom,____at the exam result,didn't know what to say Emma didn’t know what to say at the moment.(改为含有宾语从句的句子) my mother didn't,know《C what to do it She doesn't know what to say __ do. l didn't know what to say中didn't为什么用过去式 I didn't know ( )to say.为什么填“what to say” 高二英语The mother didn't know（ ）is to blame for the broken glas I didn't know what I should say 用 what to do 替换