You are given a sentence and a question. You're expected to write the correct answer based on the sentence.

Sentence: An envelope that is slid across a dresser gets rather hot, while one that is slid across a desk doesn't get very hot at all. Question: Which surface has more friction?
dresser

Sentence: A paper towel is placed over a cup. So is a sheet of iron. Question: Which surface will be easier to drill through?
Paper Towel

Sentence: Shawna and Lynn are on a tandem bicycle. Shawna is pedaling furiously, while Lynn is barely moving and letting Shawna do most of the work. Question: Which of the two will show perspiration stains on her shirt first?

Shawna