Children under sixteen are not permitted to participate in such kind of activities _____ bad for their mental development.

 For many years we have been keeping in ____by sending each other e-mails or phone calls.

______, but the idea of having to work more than ten hours a day without weekends discouraged me. 

Europeans made ______ clear that they did not want to take the Roma as neighbors.

He ____ in the north, but now he ____ here．