His sister left home in 1998, and ________ since. [ ]

Many countries, American,Japan, Brazil and Spain, want to host the 2016 Olympic Games.

It is strongly suggested that measures________factories to pour waste into rivers by the government.

________you interrupt now? Can’t you see I’m on the phone? — SorrySir, but it’s urgent.[ ]

Though having lived abroad for years, many Chinese still ______ the traditional customs.