When making modern cameras , people began to_______ plastics for metal.
A、surroundD
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Please be serious. I am not _______. You should consider it carefully
Bothsugarandsaltcan______inwater.
Carelessnessmadehimfallinhisjob_______.
It is not ---_______ for me to return all the books to the library now because I still need some of them for my research.
Although the trffic is not busy, he likes to drive at a_______ speed.
