A:(﹣∞,0
B:0,+∞)
C:(﹣∞, 2
D: 2 ,+∞)
John runs fastest in our school. I think he is ____ (certainly) to win this game.
甲、乙、丙三个数的比是2:3:5,已知甲数是28,则乙数是____,丙数是____.