Find the word which has a different sound in the underlined part

Part 1: Find the word which has a different sound in the underlined part.(1.0p)
1. A. bicycle B. exciting C. favourite D. widely
2. A. farther B. earth C. both D. marathon
3. A. doctor B. opening C. gold D. postcard
4. A. enjoyed B. loved C. finished D. called
5. A. kitchen B. chemistry C. watch D. catch