By the time he realizes the mistake he _____, it will be too late for him to do anything about it. [ ]

Excuse me, sir．But your bike gets the way of my car.— Sorry．I didn’t see your car.

Who _________ maths in your class —Everyone ________

We were sad to learn that several students were ____ by a car yesterday. [ ]

24. —How many chapters does the book have? —It ____ three chapters.