21. Carl is studying ______ food science at college and hopes to open up ______ meat production factory of his own one day.
A. /, a B. /, the C. the, a D. the, the
22. I think the VCD set is ______ that one I bought last month.
A. as good or better than B. good as or better than
C. so good or better as D. as good as or better than
