21. Carl is studying _____ food science at college and hopes to open up _____ meat processing factory of his own one day.
A. /; a B. /; the C. the; a D. the; the
22. ——May I help you? You seem to be having some problems.
—— _______, thanks. I think I can manage.
A. All right B. No problem C. It’s all right D. There’s no way
