I don't know what ______(say) to my grandparents.who _______

I don't know what ______(say) to my grandparents.who _______ i don't know what to say I really don’t know what to ______ about such a thing.A.say i don't know what to say.可不可以说i don't know say what有没有用say w I don't want to say goodbye _______ my friends. 1:I really don't know what to say. i don't know what to say 同义句 THEN I DON;T KNOW WHAT TO SAY SO EXCITING. I don't know what to say sorry that I really don't know what to say, i dont know what_____(say)to my grandparents i don't know say what