It's quite warm here; we ________ turn the heating on yet.
It is difficult for us to learn a lesson in life _____we’ve actually had that lesson.
____fire, all exits must be kept clear.
—Where’s that report? —I brought it to you ____you were in Mr. Black’s office yesterday.
This is a junior school. You should go to a senior school girls of your age.
Some people choose jobs for other reasons _____money these days.