"Worse" is used to compare to objects, while "worst" is used for three or more objects. Given that two items are being compared here ("styrofoam and plastic"), "worse" should be used instead of "worst."

When two items are being compared, the comparative adjective “more” is the appropriate word to use, while the superlative adjective “most” is appropriate for comparisons involving three or more items. Here, two items ("skirts and pants") are being compared. Therefore, “more” is the appropriate word to use, not “most.”

When two items are being compared, “more” is the appropriate word to use, while “most” is appropriate when comparing three or more items. Here, three items are being compared: "bleach, detergent, and vinegar." Therefore, “most” is the appropriate word to use, not “more.”

When two people or things are being compared, “worse” is the appropriate word to use, while “worst” is appropriate for comparisons involving three or more people or things. Here, three people are being compared (Denise's three boys). Therefore, “worst” is the appropriate word to use, not “worse.”

Superlatives can be used when comparing three items, but when comparing only two objects, like the two cookies here), you must use comparative adjectives. So, the superlative adjective "sweetest" should be changed to the comparative adjective "sweeter" to correct the sentence's error.

Because two novels are being compared, Mary can only argue that one is "better" than the other. However, the sentences uses the superlative adjective "best" instead of the comparative adjective "better." The sentence's error could be corrected by changing "best" to "better."

This sentence compares three different sports: soccer, basketball, and swimming. Whenever three or more things are compared, a superlative adjective is used in the comparison, not a comparative adjective, which is only used for comparisons between two things. So, "faster," a comparative adjective, needs to be changed to "fastest" to correct the sentence's error.

This sentence uses a comparison adjective (“more”) when comparing three things: "walking," "taking public transportation," and "driving." A superlative (“most”) would be grammatically correct. The corrected sentence reads: "Walking and taking public transportation are also options, but driving remains the most popular way to arrive at the festival."

This sentence uses the comparative “more,” which should be used when comparing only two things. As this sentence compares all professions, the superlative “most” should be used. The corrected sentence reads, "He could have chosen any profession in the world, but he decided that accounting was the most interesting."

When two items are being compared, “more” is the appropriate word to use, while “most” is appropriate for comparisons involving three or more items. Here, two items are being compared: "black tea and coffee." Therefore, “more” is the appropriate word to use, not the phrase “the most.”