I. Choose the work that has the underlined part pronounced differently from the others :
1. A. robot B. go C.no D.not
2. A machine B.cheap C.watch D.children
3. A.stand B.hand C. father D.apple
4. A.living B.wireless C. hi-tech D.nice
5. A. ask B.plastic C.back D.grandparent
6. A. hear B.marbles C.stars D.solar
7.A.hear B.clear C. bear D.fear