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6. Strawberries are plentiful/limited/renewable and cheap in summer.
7. Our harmful/ available / nuclear natural resources will run out soon.
8. Using green sources of energy can make the air cheap / unlimited/clean.
9. Solar energy seems to be limited / unlimited/ harmful - we can rely on it for a very long time.
10. The air becomes worse because of polluted/polluting/pollution gases from that factory.
VII. Fill in the blanks with the present continuous tense form of the verb