1.If we (recycle) ________ more, we will help the Earth. 2. Factories (not dump) ______________waste into rivers if the government fines them heavily. 3. If I were you, I (look) ________________ for a new place to live. 4. If Lan ( not be) _____________ill, she would join out tree planting activity. 5. If people really cared about the environment, they ( not dump ) ________________ waste into the lake. 6. If there was no fresh water in the world, what (happen) ________________. 7. Four countries ……......…………… (visit) by Mr. Brown so far. 8. London ………………… (have) a population of eight million people. 9. Most people (leave)........................before the volcano (erupt)....................... 10. They (spend) ....................the night in the flooded area before help (arrive)....................... 11. Ten new houses (build)............................... in the town every year. 12. They (come) …………….. back home after they (finish) ………………… their work. 13. Before he (go) …………………….. to bed, he (read) ………………………… a novel