When it______ air pollution, Beijing faces the three “C” s-----cars,coal and construction,which lead to Beijing's thick air pollution.
_________ its low cost, the appeal of iron as a building material layin its strength, its resistance to fire, and its potential to span vastareas.
Your story has little the facts.
The problem will _________ unsettled until the director comes backfrom abroad.
This room is partly _________ with a few old armchairs.
The family were so pleased when the long-lost jewels _________.