Some people believe _______ has happened before or is happening now will repeat itself in the future.

Can I smoke here? — Sorry, we don’t allow people _____ here. [ ]

Ever since my brother graduated from the university, he _______ in the present company for 15 years and he is now chief engineer of the company

All the volunteers were very tired, but ofthem took a rest.—They were busy looking for the missing people.

Could you tell us ______—In two days.