. We are faced with the necessity to recognize that having more people implies a lower standard of living.
More and more Chinese people follow the practice ______ they will travel to various scenic spots to enjoy the scenery in their leisure time.
Do you know ______________ had reported the accident to the police?
Passengers on board aren’t allowed _____ calls during take-off.
During the 1960s, songs about winter ___________ by many famous rock groups were popular among people of different ages.
__________ in the fields on a March afternoon, he could feel the warmth of spring.