Complete the sentences with the superlative form of the adjectives in parentheses. Kelly: I think people are too concerned about having (1) (modern) cell phones. Cell phones contain some of (2) (rare) minerals on Earth, but many people just throw their old cell phones away when they buy a new one. This is (3)(one of the / bad / thing) you can do! But if you recycle your old cell phones, it’s (4)(one of the / good / thing) you can do.