-Do you know ___?-Sorry,I don't know

Do you know ___?-Sorry I don't know. -Do you know ___?-Sorry,I don't know sorry i don,t know what i can do next sorry i don't know ___ Do you know--------last night?Sorry,I don't know .--Do you know when he ___ back --Sorry ,I don”t .When he __ --Mary,do you know_________________? .--Sorry, I don’t know -Do you know when he_ the work?-sorry,I don't know ,but I th Do you know the way____the post office?Sorry,I don't know,__ Do you know where Niagara ______(fall)is?Sorry,I don't know do you know what the clotheswere made ( sorry,i don't know.是 do you know who the hair band （）?----sorry,i don,t know. sorry,i don,t know.are you know?