If ____ unsolved, the problem of food safety may lead to more serious results.

A sheep_______on this kind of special grass usually grows much faster than_______on ordinary (普通的).

The document film ______ next week aims at introducing local cultures to the world.

The recent financial crisis _______ into consideration, the Japanese boss ______ back on the number of workers working for him.

Helen had to shout ________ above the sound of the music.