What’s the matter with the little boy?—A bad traffic accident happened _____ him. What a pity![ ]

Let Lin Tao and ________me, will you? They are my good friends,

He is cutting the apple a knife.[ ]

You look unhappy, what’s happening, my son? —I’m wondering how long it’ll be________ we come to China again.

We can’t pass the exam _____ the teacher’s help. [ ]