根据句意及首字母提示补全所缺单词。

1. —Are you going to come?      —P_______. I'll see how I feel.

2. Don't spit in p________. It's impolite and isn't good for the environment.

3. Tom had a bad cold and he c________ a lot.

4. "Please be quiet. The baby is sleeping," she said in a low v________.

5. As a student, we should obey the rules and can't b________ the rules.