A:that
B:which
C:the one
D:the one what
① 512 ____ 2560 56 ____ 113 34 ____ 712 0.875 ____ 78
② 118 ____ 118 31112 ____ 22112 13+12 ____ 35 1−57 ____ 38
15-9=____
8-3=____
9+3=____
14-4=____