— Have you finished your project?— Not yet. I’ll finish it if I ____________ ten more minutes.

No one knows how the huge rocks   and ___ without our modern machines eight hundred years ago.

I saw Li Ming ______ near the river on my way home.

—What a nice classroom! —It _____ every day.

–Our classroom _________ twice a day. So it is very clean.–It is important for us to do this.