.Over the past decades, sea ice _____ in the Arctic as a result of global warming.
Around 1850,a terrible disease ______the potato crop,and potatoes ______bad in the soil.
The idea suddenly______me is that we should go outing.
As you study a globe,you may notice that ______ of the large land and areas are connected,or ______so.
The houses in this village are______built of bricks.
The poisonous atmosphere will surely ______a lot of people.