The national parks are very important for the protection of these wild animals, which would ______ run the risk of becoming extinct.

She didn’t mention her troubles to Mr. Li，who might have helped her ______.

 --- You've finally figured out the puzzle！--- Yeah, in a complex way, _______.

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

---- 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.