In the US, students can do almost anything they want in class, ____ they don’t make too much noise or disturb others who want to learn from the teacher. 

This still leaves the question of ______ local public services should be improved in the next five years.

The value of life lies not in        many days we live, but in ____ use we make of them.

Don’t answer me with a simple “yes” or “no”. Explain ______possible.

Mr. Smith doesn't go to his usual club, ________ it is being decorated these days.