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26. Solar energy is __________ and it can be replaced easily.
A. new B. renewable C. cheap energy D. non-renewable

27. For many people living in rural areas, biogas is a cheap energy __________ available.
A. method B. production C. supply D. consumption

28. Nuclear energy can provide enough electricity for the world’s needs, but it is very __________.
A. risk B. risky C. endanger D. endangered

29. Alternative sources of energy are __________ and safe.
A. enough B. not enough C. short D. abundant

30. Sources of energy will be used more __________ for our future.
A. effective B. efficient C. effectively D. efficiently

31. A sky safety system will stop everyone __________ crashing in the sky.
A. at B. from C. through D. for

32. __________ regular light bulbs with low energy light bulbs, which use less energy.
A. Turn B. Replace C. Place D. Put

33. Without good insulation, the __________ in our houses goes out through the windows, the doors, etc.
A. ice B. atmosphere C. amount D. heat

34. A(n) __________ station will be built in the North of the country next decade.
A. hydropower B. water C. hydroelectricity D. energy

35. We can __________ the problem of energy shortage by using solar energy.
A. carry out B. get C. recover D. solve

36. Don’t forget to __________ the lights when leaving a room or going to bed.
A. turn B. turn on C. turn off D. turn out

37. What should we do to __________ our electric bills?
A. fall B. cut down C. drop D. reduce

38. The use of biogas for cooking __________ in the countryside.
A. will increase B. will be increasing C. will be increased D. will have increased

39. The digital camera belongs to Nick. That camera is __________.
A. he B. be C. his D. one

40. Is this schoolbag __________?
A. you B. your C. yours D. them

41. The city is working on a project __________ the slums with clean water.
A. providing B. to provide C. provide D. to providing