There/ be/ no simple solutions/ the problem of overpopulation 2. Renewable energy/ become/ more important/ next few years 3. Solar power/ convert/ into/ electricity/ by solar panels 4. Last year/ he/ leave/ his hometown/ because of/ convenient life/ the city 5. Biofuels and wind power/ regard/ as/ most potential technologies 6. The city/ work/ to improve/ public transportation/ now 7. At nine o'clock/ Sunday/ wel visit/ a hydro power plant 8. I/ hope/ renewable energy/ use/ more often and widely

1 there are no simple solutions for the problem of overpopulation

2Renewable energy will/might become more important in next few years

3solar power is converted into electricity by solar panels

4 last year,  he left his hometown because of the convenient life in the city

5 Biofuels and wind power are regarded as the most potential technologies

6 the city is working to improve public transportation now

7 At nine o'clock lasst Sunday, we were visiting a hydro power plant

8 I hope renewable energy will be used more often and widely