可以

can; may; will; should; could; might; shall; be able to; OK; okay; able; right; acceptable; passable; satisfactory; safe; yes; ahead; surely; all right; able to; pretty good; not bad; by all means; I don't mind if I do

便宜

cheap; inexpensive; budget; low-cost; money-saving; economy; cheapness; bargain; get off lightly; cheaply; inexpensively; affordably