How is everything going on with you in the UK? — Quite well. Not so smoothly as I hoped, _____.

It’s high time you had your hair cut; it’s getting _____.

Professor White has written some short stories, but he is________known for his plays. 

---- I was riding along the street and all of a sudden, a car cut in and knocked me down. ---- You can never be _______ careful in the street.

We are taught that business letters should be written in a formal style           in a personal one.