用括号中所给单词的适当形式填空

1. People are not the only ones hurt by air __________(pollute).

2. The situation was much __________(bad) than they had expected.

3. Compared with the past, people today are __________(healthy) and live longer.

4. “What do you think is the most important __________(different) between the two words?”

    the teacher asked.

5. As everyone knows, exercise can make us feel __________(relax).