— This problem is too difficult.

— You can't work out the math problem unless you ______ to your teacher carefully. [ ]

A. will listen

B. listen

C. won't listen

D. don't listen

上级国家机关的决议、决定、命令和指示，如有不适合民族自治地方实际情况的，自治机关可以报经该上级国家机关批准，（）。

A.拒绝执行

B.停止执行

C.变通执行

D.退回上级国家机关