Which word has different sound in the part underlined

I.Which word has different sound in the part underlined

1. a.coffer        b.cathedral         c.grocery       d.cake

2.a.wide          b.countryside      c.execiting     d.convenient

3.a.teacher      b.weather           c.eat            d.beach

4 a.cheap          b.school             c.lunch         d.chair

5 a.less            b.get             c.delicious          d.expensive