1. The word with a different sound in the underlined part is **C. aware**. The "a" in "aware" is pronounced differently (as in "air") compared to the "a" in "craft," "carve," and "cast," which are pronounced more like the "a" in "cat."

2. The word with a different sound in the underlined part is **D. frustrated**. The "u" in "frustrated" is pronounced as a schwa (ə) sound, while the "u" in "surface," "drumhead," and "multicultural" have a different vowel sound.

3. The word with a different sound in the underlined part is **A. craftsman**. The "s" in "craftsman" has a "ts" sound, while the "s" in "housekeeping," "cost," and "preserve" is a single "s" sound.