Read the text below and think of the word which best fits each gap. Use only one word in each gap.

The principles 1) ____ positive psychology are a permanent feature of office life in 2) ____ day and age. Most employees have participated in team building exercises, or attended seminars on the importance of positive feedback. 3) ____ this, researchers are still making new discoveries about positivity and its impact on office life. A recent study looked at 4) ____ high fives, hugs and team huddles among members of a basketball team affected their performance. The focus of the study was the extent to 5) ____ team members used such physical contact to build trust and cooperation on the court. The findings revealed a distinct connection 6) ____ physical contact intended to reinforce positive emotions and the team's success on the pitch. So 7) ____ though most companies prefer co-worker to keep their distance from one 8) ___. Even so, it seems that a high five or good old pat on the back for work done well 9) ___ do a lot more for office morale than previously thought.