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V. Choose the best answer
1. People rarely (is using/ use/ used/ uses) solar energy because it's expensive.
2. (Wind/ Oil/ Coal/ Natural gas) power is a renewable source.
3. The energy we use that produces carbon dioxide might create a big (non-renewable energy source/ renewable energy source/ fossil fuels).
4. "Non-renewable energy" means that it will (produce/ run out/ replace) if we use it.
5. People put (plastics/ solar panels/ nuclear/ biogas) on the roof to catch the sun's energy.
6. Nuclear power is expensive and (conveniently/ abundant/ dangerous) plentiful.
7. Sit down! You (are stand/ stand/ are standing/ stood) on the flowers.
8. Tomorrow is Mai's birthday. I (will pack/ is packing/ packing) this gift to her at the moment.
9. In the countryside, people will burn plants to produce (hot/ heat/ heating) water (turbines/ panels/ pipes).
10. Susan got a plumber to check cracks in the water (turbines/ panels/ pipes).