直接写得数。
18-9=____
13-5=____
17-8=____
32-6=____
24+6=____
28-12=____
6+50=____
66-6=____
27+30=____
南极洲的地理特点是( )
I love this song by Lady Gaga. Would you ________ the TV a bit, please? I can't hear it clearly.
下列说法正确的是( )