________ the police thought he was the most likely one，since they had no exact proof about it，they could not arrest him.

It is the third time that he ____ abroad on business this year.

____ the students in our school go to college in theirteens.

_____ the rising birth rate and immigration, the declining death rate also resulted in the population growth[ ]

President Xi Jinping arrived _______ London _______ the evening of October 19th to pay a five-day visit to Britain.