He handed in the essay two days later than his classmates,but it was still _____the time limit set by the teacher.
Whether the buildings in this area should be pulled down has remained ________; people are still looking for other possible solutions.
Can you tell the ________ difference between the words “require” and “request”? I sometimes get puzzled by their meanings.
“Perhaps we need to send for Dr. Smith to see what we can do about it,” Father suggested ________ to his neighbor who had come to discuss the problem.
On our journey to Australia last summer, our luggage was _____ at the customs. We were not allowed to carry food such as meat and vegetables.
Usually a meteorological observatory (气象台) _____ air quality in urban areas from one to five: excellent, fairly good, slightly polluted, poor, and dangerous.