V. Choose the word (A, B, C or D) that best fits the blank space in the following passage.

Students can help protect the environment in many ____23___. Recycling is one of them. ____24___ keeps natural resources from being overused to make things that can be made over and over again without using up any more of the materials. People who don't have jobs or can't afford to buy new things all the time can save money by buying ____25___ items. When someone doesn't want to buy something brand new, they will sell their old stuff on Facebook Marketplace or Craigslist for money. They will then buy something brand new with the money they made from selling their old stuff instead of the original price they paid.
Students can also cut down waste by reusing items ____26___ buying brand-new ones they will only use once. For example, they don't have to buy a new pencil case every year; they can use the one they already have. Students can just keep using an old one until it gets ____27___ out, then they can buy a new one. Students can also help reduce waste by bringing their own bags to the grocery store. This will cut down on the number of plastic bags that companies have to make every day. Plastic is extremely difficult to ____28___ and will pollute the environment. Thus, protecting the environment is not difficult if we work together.