He trained hard in puzzle-guessing, a sort of children’s game, all year, _____ still failed to reach his best form in all the tests given to both adults and children. 

– I’m sorry for what I said. -- Forget it, I can’t remember _________.

Mary is very clever and _____ worth teaching, but her brother is not. Look, he is now _____ asleep in class.

— Ugh, what a mess! You need to clean the room          right now, lazy bones!— But the exam is approaching!

I sincerely regret that I have hurt your feelings, but I didn’t do it ______.