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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.
39. There aren't many students taking part in the event.
40. They moved here two years ago.
41. If you don't turn unwanted light off, you will waste a lot of electricity.
42. Why don't we write about three Rs ?
43. It's fun to learn about recycling.
44. Reusabe bags are more costly than plastic bags.
45. You shouldn't throw old clothes away.
46. Don't turn the tap on when you are brushing your teeth.