r by accident or____, he arrived too late to help us.

下列诗句书写正确无误的一项是

Look at Helen in the room.She is still working so late. 一 It _____be Helen there. She has flown to London with her parents this morning. [ ]

Unfortunately，the careless accident_______him his life.

Alex, the bus is coming, but I have to go back to change my coat.—_______, or we’ll miss it.