— John, could you please the black-board now? It's your duty today.— OK. I'll do it right away.
A:not to clean
B:to clean
C:not clean
D:clean
This is a map _____ Wuhan.
下列有“水”字的物质属于溶液的是( )
如图,在平面直角坐标系中,直线AB与x,y轴分别交于A,B两点,OB=8,OA=6,M是OB上一点,将△ABM沿AM折叠,点B恰好落在x轴上的点C
You should return the book____the library on time.