Answer:
9: heart attack
Explanation:
This is the only logical response grammatically. You don't use "to have" with most of these words except "turbulence" perhaps, but you would not refer to it as "a massive turbulence"
"A massive heart attack" is a common phrase.
the ratio is 5:10, 5/10 5 to 10 my explination is cause ratio is to have the same number but in a diffrent form like, for example, a fration.
