Tom has agreed to let me use his computer to surf the Internet, and ____ I' m treating him to a good dinner

at the newly-built restaurant just around the corner. [ ]

A. in charge

B. in place

C. in return

D. in turn

在一个国家陆地和领海上空，禁止航空器飞行而划定的空域为（）。

A.限制区

B.禁区

C.危险区

D.保护区