Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage

During high school, it's easy to become stressed in balancing a number of (24) ____. But between all the stress and pressure of keeping up with your various activities, it's important to contribute to the community, and make (25) ____ to protect the environment. So here are a few tips on ways you and other teens can "go green".

One of the easiest ways teens can go green is simply to turn off the lights. Open up the curtains and (26) ____ the natural sunlight brighten up the room, or turn off the lights and fans when you leave a room that no one else is in studies have indicated that (27) ____ electricity helps to reduce global warming.

Another way to go green is to use your bike, or walk. Using your bike or walking reduces carbon (28) ____, and it is a great way to exercise. Therefore, by riding a bike or walking, not only are you helping the environment, you are (29) ____ contributing to your own health.

You could also try (30) ____ a reusable water bottle. Buying a reusable bottle is a smart investment because not only plastic water bottles often go un-recycled, but buying a reusable water bottle can actually save you money over buying plastic bottles over and over again as well.

Another great idea is to (31) ____ your computer and all other electronics before you go to bed, or after you are done using them. Although you may no longer be using your computer, it stills uses electricity in small amounts that add up.

Finally, you can go green by turning off the faucet. Many people leave the faucet (32) ____ while they brush their teeth, but this is just wasting water. Turing the faucet off (33) ____ you brush your teeth can save the world a lot of water.