People have always been ________ about exactly how life on earth began.[ ]

Suddenly the idea came to me ____ I mightturn to Mr．Smithfor help．

The walls of the rooms are said ___white inno time

Those farmers who _________ move from place to place with their animals in the past have moved into new houses at last.

Wikileaks became world famous as it _______ a great deal of US military intelligence and posed a serious threat to the US government.[ ]