There are many passengers hit by cars and killed ________ because of the drivers’ overdrinking, so drivers’ drinking is strictly limited now.[ ]
We went through a period______communications were very difficult in the rural areas.
It’s a good song, _____ the lyrics（歌词）are not good enough.
_________that river ________very clean
What sort of house do you want to have? Something big?–Well, it ______ be big–that’s not important.
