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39. There are a few students taking part in the event.
There aren’t ____________________________________________________
40. They have lived here for two years.
They moved here ________________________________________________
41. You should turn off unwanted lights, or you will waste a lot of electricity.
If you _____________________________, you will waste a lot of electricity
42. Let’s write about the three Rs?
Why ________________________ about the three Rs?
43. Learning about recycling is fun.
It’s_____________________________ about recycling.
44. Plastic bags are cheaper than reusable bags.
Reusable bags are ________________________________________________
45. It’s not good to throw old clothes away.
You shouldn’t __________________________________________________
46. Remember to turn off the tap when you are brushing your teeth.
Don’t _______________________________ when you are brushing your teeth.