38. reuse
39. free
40. electricity
41. picking up
42. plastic
43. Excuse me, is there a bus station near here?
44. Would you like to take part in our school's cleanup?
45. Trees help to keep the environment clean and green.
46. You can give old clothes to the local charity.
47. is to the right of the police station and to the left of the post office.
48. Pick up trash to keep our community clean.
49. The cinema is on Miller Street, which is opposite to the arcade.
50. There is a shopping mall next to the train station.