. --- Believe it or not, I passed the driving test at the first attempt yesterday.--- Great! But remember you can never be ___ careful when driving a car in the street.

Running a company is not ______ a matter of hiring people—they also need to be trained.

— So you missed the meeting．— ______. I got there five minutes before it finished.

He devoted himself _______ to his research and got many achievements.

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