Persons under18 not be employed in night work in the United States.
_____he said in the lecture has a great effect on me.
The teacher warned her students ______late for the sports meet next Monday.
The soil is becoming poor because farmers here mostly use only one kind of chemical fertilizer for several years________.
With the city ________ clouded by dirty smog, the government has planned to shut down the four major coal-fired power plants.
The IOC Evaluation Commission has come to a ________ conclusion that Beijing is capable of hosting a successful 2022 winter Olympics.