Will this one hold? After the quick collapse of a February cease-fire, skepticism abounds over a deal struck in Geneva by the U.S. and Russia to end Syrian hostilities at sundown Monday. It calls for the government — which announced its approval yesterday — and rebel groups to join in targeting ISIS and al-Qaeda. Violence continued Saturday, with an airstrike of undetermined origin killing 13 children and 45 others in rebel-held Idlib. The five-year civil war has killed an estimated 500,000, and would pause for 10 days if the agreement’s honored.