It was very late, but the teachers were ________ working hard in the office.

— Kitty, there’s ________ cooking oil left in the kitchen. Would you please go to the supermarket and get ________?— OK, Mum. 

I was so tired after a day of hard work that I could ______ move any longer.

 ---George, how can you prove the earth is round?---I can’t, sir. ______, I never said it was.

— Did you find the small village yesterday?  — Yes, without any difficulty, for it has ______ changed over years.