— Excuse me, but could you tell me how to get to the post office? 

— Keep ____ straight for two blocks. The post office is right on your left. [ ]

A. to go

B. go

C. to going

D. going

国家机关、人民团体和国有公司、企业、事业单位（）明确有关内设部门承担本行业或者本单位预防职务犯罪的具体工作。

A、必须

B、应当

C、可以

D、应该