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Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks.

Forests are useful to mankind in several ways. Wood Is always necessary for building and for making all kinds of things and we usually need firewood in our homes. Forests provide timber, one of the most (23) .................. resources, but they must be used wisely and managed (24) ................... Men should control the cutting of trees in such a way that the forest grows more trees (25) .................. it would be cut, leaving the young ones to grow bigger. Trees and shrubs are also needed to preserve land (26) .................. their roots bind the soil, preventing heavy rain (27) .................. washing the soil away.