________ a certain doubt among the people as to the practical value of the project

John seemed puzzled about _____ the question meant.

Look, Victor. This brown cat is ________ than thatwhite one.—Yes. And it is _____ of all these cats.

He was admitted into Beijing University and years of his hard work ________ eventually.[ ]

My sister-in-law___________ my brother for ten years.[ ]