(20) the benefits.
1. [a]generate [b]raise [c]produce [d]manufacture
2. [a]answered [b]met [c]calculated [d]remembered
3. [a]for [b]without [c]as [d]about
4. [a]moreover [b]therefore [c]anyway [d]however
5. [a]expensive [b]mechanical [c]flourishing [d]complicated
6. [a]gifted [b]skilled [c]trained [d]versatile
7. [a]keep [b]maintain [c]retain [d] protect
8. [a]since [b]so [c]and [d]yet
9. [a]charge [b]price [c]cost [d]value
10. [a]accept [b]gain [c]receive [d]absorb
11. [a]frequently [b]incidentally [c]deliberately [d]eventually
12. [a]soon [b]quickly [c]immediately [d]first
13. [a]some [b]others [c]several [d]few
14. [a]might [b]should [c]would [d]will
15. [a]adopting [b]conducting [c]receiving [d]adjusting
16. [a]to [b]at [c]on [d]about
17. [a]opaque [b]secret [c]sealed [d]hidden
18. [a]tackle [b]learn [c]study [d]manipulate
19. [a]in [b]through [c]with [d]under
20. [a]except [b]nor [c]or [d]but
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