I hear you've got some new Australian coins. __________ I have a look?

“Passengers _____ not have their breakfast on the light train”. This rule arouses heated debates in Chongqing.

Jenny doesn’t agree with her father, but she ________ that to his face.

---Look at the boy running on the playground. Is it David? ---It ______ be him. I saw him go to the teachers’ office just now.

To forbid the cheating strictly in this important exam, the authorities have released a rule that students _________ bring any reference books and stationery into their classrooms.