Soon children in the camp had many friends, _______ they shared food, stories and projects.
After a short holiday, he _____ himself once more to his studies.
The family is a cooperative enterprise for which it is difficult to _____ rules, because each family needs to work out its own ways to deal with its own problems.
Keys should never be hidden around the house since thieves _____ know where to look.
The Department is also deeply _____ in various improvement schemes.