You should have prepared your speech for the meeting，Mrs Smith.—Yes，I know.But how could I________the meeting date fixed so soon

Father was reading a newspaper, ________ Mum was cooking dinner when I got home yesterday.

We will have a _____ holiday after the exam.

Unless _______ , he kept silent all the time.

Miss Gao asked a question,but it was ___________that nobody could answer it.