Ask American which city has the worst air pollution, and the answer is sure to be Los Angeles.
The adoption of orphans and physically challenged children has been a subject of public debate _______ a fire in an unregistered orphanage last month.
Rain and high winds today _______ to take the place of yesterday’s mild conditions.
The manager listened to the customers’ complaints attentively with great patience, _______ to miss any point.
Most students think they should have _______ at school if there were no examinations.
Teachers _______ be sensitive to the development level of each student so as to help them better.