1. The problem asks to identify the correct answers for each multiple-choice question based on meanings. 2. For question 1, casual clothes are typically comfortable and informal. Blue jeans and a track suit fit this description. 3. For question 2, musicians excel by practicing every day, listening to their teachers, and having innate ability. Watching television does not help. 4. For question 3, a mediocre grade is average or below average. C- fits this description. 5. For question 4, a ravenous person is very hungry and would want to eat. **Final answers:** 1. (a) blue jeans, (d) a track suit 2. (b) practicing every day, (c) listening to their teachers, (d) having innate ability 3. (b) C- 4. (a) eat