21.After he retired from office, Rogers ______ painting for a while, but soon lost interest.
A. took up B. saved up C. kept up D. drew up
22.The visiting professor ____ to students _____ to meeting at time.
A. preferred giving lectures; to being invited
B. preferred to give lectures; to be invited
C. preferred to giving lectures; rather than being invited
D. preferred giving lectures; to be invited
