21-25. Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage.
Man cannot go on increasing numbers at the present rate. In the next 30 years, man will face a period of crisis.
(21) _____ experts believe that there will be a widespread food (22) _____ . Other experts think this is too pessimistic,
and that man can prevent things from getting worse than they are now. But remember that two-thirds of the people in
the world are undernourished or starving now.
One thing that man can do is to limit (23) _____ of babies born. The need (24) _____ this is obvious, but it is
not easy to achieve. People have to be persuaded to limit their families. In the country of the population (25) _____,
many people like big families. The parents think that this brings a bigger income for the family and ensures there will
be someone in the family who will look after them in old age.
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