21. There is no power like _____ power of confidence, and there is no student as competitive as _____ student who trusts his own abilities.
A. the; a B. a; the C. /; a D. the; /
22. ---Why do you choose to work in an international travel agency?
---Well, you know, English is my ______. So it is my best choice.
A. strength B. talent C. ability D. skill
