There _____ be anybody in the classroom, for the lights are off. — I’ll go and check. [ ]

Bad luck! It’s too late.—It doesn’t matter. The concertforonly a few minutes. You can’t miss it.

Hi, Tom. Do you have any idea where Jane is?—She _________ in the classroom. I saw her there writing her composition just now.

The Internet is a wonderful discovery,___of great significance to people’s lives.

My father has a habit of jogging ___________ the river in front of my house for an hour in the morning.