Last weekend we did an environment project at school. Our teacher gave us a lot of information about animals and plants in our area. We also found useful websites on the Internet. My favorite part (40) __________ a trip to the forest. We took many pictures and made a video of the animals. Then the teacher taught us how to (41) __________ the environment. There are a lot of things we can do. First, don’t drop litter in the street because it looks and smells terrible. (42) __________ plastic bags in the sea either because fish will die. At home, turn (43) __________ the lights when you leave the room. Try to (44) __________ electricity and water when you can. You can also recycle glass bottles and jars to store food or plant flowers. I had a (45) __________ time. It’s more fun than learning in the classroom! 40. A. is B. was C. were D. will be 41. A. safe B. keep C. change D. protect 42. A. Throw B. Don’t throw C. Pick D. Don’t pick  43. A. off B. on C. in D. up 44. A. use B. throw away C. save D. donate 45. A. boring B. sad C. terrible D. wonderful