... ask c. would ask d. will have asked 21. Does the earth have _____ natural resources to support people? a. so much b. so little c. enough d. such 22. The police provide _____ for the people in ... safeguarding and preservation of natural resources, so that they can continue to be used and enjoyed. In the past, most people believed that the world’s resources could never be used up. Today, we ... forests, soil, wild-life, minerals and human lives. As important is the fight against pollution of our environment, in particular, the dirtying and poisoning of air and water. Conservation is also...