23. Mary___________the job offered to her, but she didn’t.
Either you or one of your family members __________the opening ceremony next week.
Our class discussed the question of __________it is necessary for us students to use mobile phones on campus.
—Peter, your hair is getting much too long. It’s high time you __________it cut. —OK. I will.
__________people relaxation and pleasure, but it can also increase their knowledge of any kind.
It was in the lab __________was in the charge of Professor Smith __________they carried out the experiment.