Where is my pen?—It’s _____ pencil-box. [ ]

Tom was thinking about how to explain to the teacher why he was late for class, when a good idea _______him.

About two _________boys took part in the running race.

It’s difficult for me to decide which one to choose, because ______ of them are good.

You are late again. The class ________ for five minutes. —Sorry. There is something wrong with my bike.