Check your english vocabulary for rawdon Wyatt

Page 16 Focusing attention answers
A.
1. simply 2. largely 3. primarily 4. mainly 5. exclusively 6. particularly 7. specifically 8. notably 9. mostly
10. purely 11. chiefly
The word in the shaded vertical strip is 
principally
B.
Only or solely: simply / exclusively / specifically / purely
In most cases, normally or the main reason: largely / primarily / mainly / particularly / notably / mostly / chiefly
Other words and expressions you might find useful include:
for the simple reason that / purely on account of