Исчисляемые и неисчисляемые существительные

Replace the underlined nouns in the singular form by the plural one. Is
this replacement always possible? What nouns are uncountable?
1. There wasn‘t enough evidence to prove him guilty.
2. You should take legal advice before start divorce proceedings.
3. This is a matter I know little about.
4. If I pay this debt I shall have no money left.
5. A barrister is specialized in arguing cases in front of a judge.
6. A solicitor deals with petty crimes.
7. What does a US attorney do to affect the wealth, rights, freedom &
reputation of the individuals?