IV.
1. pollution
2. relaxed
3. comfortable
4. depressed
5. fashionable
6. pollution
IX.
1. so unprofessional of her not to prepare for the presentation
2. so confident to say that she would win first prize
3. was relieved to hear that all of his students had made progress
4. surprised to learn that he is the only child in his family
5. aware that physical education is an important school subject
6. was happy to learn that her daughter had enjoyed herself at the party.