The number of students in our school _________ by over 20 percent in the last three years .

was about to walk over to Tom’s seat when he ____ and left.

I plan to be the top student in our school this term. —.

If you happen to get lost in the wild,you’d better stay ______ you are and wait for help.

We planned to meet at 10:30 at the station last Sunday, but Bob didn’t ______ until 12:00.