Mark the stressed syllable in each work. Change these sentences into the passive voice

Bài 1.Mark the stressed syllable in each work. 
1. obese.                               3. ecology 
2. degree.                              4. geography 
Bài 2. Change these sentences into the passive voice. 
1, Mr. Smith will collect the tickets. The tickets.... 
2, A local artist painted the picture.....
Bài 3. Make conditional sentences type 2 from tthe clues. 
1, if/there/be/no/war/,people/live/more/happy.
2, if/I/be/you/, I / plant/ vegetables / garden. 
3, More/ tourist/ come/ here/ if/ beach/ be/ cleaner.