useless trivia: What Word Means: A Muscle Spasm - To Constrain?

Questions

---------- goes first in tic tac toe?

'crack' gets its name because it ---------- when you smoke it?

---------- of mcdonald's profits come from the sale of happy meals?

a bowl of ---------- contains twice as much sodium as a bowl of potato chips?

a bowl of wheaties contains twice as much ---------- as a bowl of potato chips?