He must have sensed that I ______ him. He suddenly glanced at me and said quietly, “Why are you staring at me like that?”
Be careful when you cross this very busy street. If not, you may _____ run over by a car.
My teacher _____ me the key to the classroom but I’m afraid I _____ it.
---John and Tom, you two clean the classroom today, _____? ---But we cleaned it yesterday.
Pleasant as they made it ______ in Jiuzhaogou, we felt tired after the long journey.
Although the police thought he was the most likely one, _____ they had no exact proof about it, they could not arrest him.