Hurricane Sandy’s arrival and its effects ________ New York’s offices being closed for three days

air quality in urban areas from one to five:excellent, fairly good, slightly polluted, poor, and dangerous

nment-friendly Olympics requires Beijing toimprove its environment, turning itinto an ecology-friendly city

Future agriculture should depend on high technology __________ traditional methods

The word “your” has ______ “y”, _____”o”,______”u” and _____”r” in it.