Last term our maths teacher set so difficult an examination problem _____ none of us worked out.

26The company _______ a rise in salary for ages but nothing has happened yet

下列各句中画线成语的使用，不正确的一项是（ ）

They couldn’t work for the restof their life.

It disappoints the specialists that Canada is faced with the similar problem as the Internet meant to bring people closer to set them apart.