Choose the word that has the underlined part pronounced differently from the others

I: choose the word that has the underlined part pronounced differently from the others:
1.   A  Lamps.    B beds.     C desks.    D boats
2.   A between.   B behInd.   C chess   D. Prepare
3.   A cave.     B famous.     C late.    D valley
4.   A decorate.  B calendar   C celebrate   D clean
5.   A summer.   B sugar.      C sure.    D shopping