If _____ the same treatment again, he’s sure to get well.
Time ________ quickly. Three years passed before we knew it.
Mr. Smith is busy these days ________ a new book on how to develop a child’s reading skill.
It makes no ________ to me what she says. I won’t care.
Who do you think is the right person to ________ the task?
He transplanted the young tree to the park ____it was the best time for it .