Eye doctors recommend that a child’s first eye exam____at the age of six months old

Was it by cutting down staff _____ she saved the firm?— No, it was by improving work efficiency.

A good storyteller must be able to hold his listeners’ curiosity(好奇心) he reaches the end of the story.

Could you tell me _________ the radio without help

Helen hasn ’t shown up so far.It’s five past seven.— It’s________of her to keep others waiting.Now，let’s go.I have no patience.[ ]