11. If we go on …………………….electricity, we will have to pay a lot next month. A. wasting B. increasing C. turning on D. making 12. At this time next week we ……………….to work to support the air pollution cutting down campaign. A. will cycle B. will be cycled C. are cycling D. will be cycling 13. You can use a jet pack to ………….…anywhere easily. A. drive B. sail C. ride D. fly 14. The scars which are generated by solar energy are called ……………… cars. A. solar-wasted B. solar-powered C. solar-friendly D. solar-daily 15. I think means of transport in the future ………………….…petrol. A. aren’t using B. aren’t going to use C. won’t use D. won’t be using