Whentheideaofwinninginsportsiscarriedtoexcess,____competitioncanturnintodisorderandviolence.
____thecenterofourplanetarysystemwasconsideredasheresybythechurchintheMiddleAges.
Alltheir__havebeenshownupbytheirowndeeds.
Urbancongestionwouldgreatlyberelievedifthe____chargedonpublictransportweremorereasonable.
Ifasubstanceisdissolvedinwaterorheated，itmay（）agas.
