单项选择题 The national compulsory education provides them ______ to economic progress.

单项选择题 I used to think memory ______ were for the hopelessly disorganized, but when I hit mid- 40s it takes three trips between my home and office before I remember why I set out on the journey.

单项选择题 It is no use having this $ 500 debt______, we might as well write it off.