______ worries me that my daughter plays with her cellphone for a long time every day.
—I was caught in the heavy rain, so I couldn’t be back by 7 o’clock. —__________! Janna was here to see you.
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.