1. moistening

2. purify

3. harmonising

4. enlarged

5. historians

6. abnormalities

7. armful

8. maintenance

1 embittered

2 muscular

3 troublesome

4 uninviting

5 dreamily

6 discontentedly

7 uncomfortably

Part 2: Word Formation (Less common prefixes)

1 co-author

2 extra-curricular

3 underprepared/ill-prepared/ill-prepared

4 outwitted

5 substandard

6 underprivileged

7 rethink

8 rethink

1 wide-ranging

2 high-powered

3 seethrough

4 cast-offs

5 get-together

6 flashbacks

7 breakaway

8 washout