是用drop into the river还是fall into the river?

是用drop into the river还是fall into the river? fall down(还是into）the river i saw a boy ()into the river.用fall还是falling? Yesterday,a child _____(fall) into the river,and died. one more step,( ) you'll fall into the river? when the donkey stepped into the river Yellow River flows into,the estuary is all passengers aboard fell into the river 1、The river is about __deep.Be careful not to fall into it 【 He is ill because of _(fall) into the river yesterday. they _saw_(saw) a boy_fall_(fall) into the river while they_ A dove got a leaf and let it fall into the river close to th