Choose the word whose main stressed syllable is placed diffenrently from that of the others in each group.
1. a,houseboat b,motorhome c,apartment d,cottage
2. a,special b, modern c,wireless d,machine
3. a,appilance b,dishwasher c,countryside d,factory
4. a,robot b,locate c,iron d,cable
5. a,control b,giant c,solar d,software