The rapid growth of population must be controlled. (a)----- all sorts of attempts to solve food problem will fail. (b)----- we have to increase our food production very rapidly. We may mostly; solve our food problem by changing our traditional food habit. (c) ------, we can take potato instead of rice. (d)------ it is high time we changed our eating habit. (e)------ food can help to solve our food problem to a great extent.