__about 3:00am____July 28,1976,some people saw bright lights in the sky

John once worked in a remote mountain village school, which is ____only on foot.

I’d like to join the school volunteer project, but I’m not sure _____.

I’m sorry. I ____ the exercise book in my home. I can’t hand it in at present.

May I have your attention, ladies and gentlemen The plane in fifteen minutes. Please power off your cell phones.