21. —What have you been busy with these days?
—I ______ that the speech contest has been brought forward, so I ______ for it.
A. was informed; have been preparing B. have informed; am preparing
C. informed; have prepared D. was informed; prepared
22. The course that Beijing University offers normally attracts 30 foreign students per year, _______ up to half will be from America.
A. in which B. for whom C. with which D. of whom
