5.For such a large country,it is necessary to develop (农业) quickly. 6.Beijing is a city of more than six million (居民). 7.It’s most (遗憾的) that your father can’t come to the wedding. 8.The (受污染的) river did great harm to the farmers nearby. 9.The runners got into (位置) on the starting line. 10.All the members present at the meeting (交换) their opinions about the event.

agriculture

inhabitants

unfortunate

polluted

position

exchanged