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

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Exercise 6: Read the situations and make sentences with needn’t have. 1. George went out He took an umbrella because he thought it was going to rain. But it didn't rain. - He needn't have taken an umbrella . 2. Ann bought some eggs when she went shopping. When she got home, she found that she already had plenty of eggs. - She ……………………….. 3. A friend got angry with you and shouted at you. You think this was unnecessary'. Later you say to him/her. You ……………………….. 4. Brian had no money, so he sold his car. A few days after he won some money in a lottery. He ……………………….. 5. When we went on holiday, we took the camera with us but we didn’t use it in the end. We ……………………………………………… Exercise 7: Complete the sentences with should (have) + the verb in brackets. 1. Margaget should have passed the exam She's been studying very hard (pass) 2. You missed a great party ast night You should have come. (come) 3. We dont see you enough. You ......................and see us more often (Come) 4. I’m in a difficult position. What do you think I.......................................... ? (do) 5. I’m sorry that I didn't take your advice. I.......................................................... what you said (do) 6. I’m playing tennis with Jill tomorrow. She..........................................- she's much better than me. (win) 7. We lost the match but we .................................We were the better team (win) 8 "Is John here yet? "Not yet, but he ...................................here soon" (be) 9. I posted the letter three days ago, so it............................................................ by now. (arrive)