Directions: In each of the following group of words, there is one underlined part with a different sound. You are required to pick it out.

(单选题)______ I like economics, I like sociology much better. (单选题)Circumstances ______, I’ll go abroad to study. (单选题)New Year party is a great occasion. It is essential ______ f (单选题)Your ideas, ______, seem unusual to me. (单选题)Which teacher ______ will come to class this afternoon? (单选题)I saw a man shouting at a driver ______ car was blocking the (单选题)Officer, one of my neighbors ______ for three days. (单选题)This is a comprehensive university, of which mathematics ___ (单选题)45.（ ） (单选题)44.（ ）