He was so careless that he left _____the door ____. [ ]

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.

do you have anything in mind______________you’d like for breakfast —_______________ is okay with me. I’m not particularabout food.

Most politicians are not ______ in that countryWhich of the following is not OK? [ ]

______ halfway through the exercise, the teacher changed his mind and collected all our papers.