A:killed
B:killing
C:kill
D:to kill
There is a common saying in China________nothing in the world is difficult for one who sets his mind on it.
The boy was ____(好奇的)about everything he saw.
如图,梯形ABCD的对角线AC、BD相交于O,G是BD的中点.若AD = 3,BC = 9,则GO: BG =( ).