21. Sarah looked at _______ finished painting with _______ satisfaction.
A. / ; a B. a; the C. the; / D. the; a
22. As many as five courses are provided, and you are free to choose _______ suits you best.
A. whatever B. whichever C. whenever D. wherever
23. Whether the buildings in this area should be pulled down has remained _______; people are still looking for other possible solutions.
A. unchallenged B. relevant C. controversial D. contradictory
