1. [B] normal
2. [B] compared
3. [A] If
4. [D] easy
5. [C] Remember
6. [A] well-known
7. [C] supplement
8. [C] question
9. [B] sacrifice
10. [B] interests
11. [C] while
12. [D] cut down on
13. [B] occasional
14. [A] habit
15. [A] tough
16. [D] in addition to
17. [A] indispensable
18. [D] quicker
19. [C] productively
20. [D] above all
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