Twenty percent of the people on the earth have no ______ to clean drinking water.
About 85%of the Australian population of 20million______in the six major cities around the coast nowadays
Every family in America has had this sort of experience______there was a price increase of nearly one-third in the past two years
Polar bears live_______ on sea ice,which they use as a platform for hunting seals
______everybody enjoys fresh cut flowers around his house.few people know how to keep them for as long as possible.
Scientific surveys conducted during the climbs ______that Mount Huandoy in Peru______ 6395 meters high