Fill in the blanks.
1. According to an estimate, almost ...a... per cent of forests have been lost in the tropics, compared to ...b...per cent in the temperate region.
2. At the beginning of the twentieth century, forests covered about ...c... per cent of the land of India. By the end of the century, it shrunk to ...d... per cent.
3. National forest Policy (1988) of India has recommended ...e... per cent forest cover for the plains and ...f... percent for the hills.