Ingrammaticalcontext,themeaningofawordmaybeinfluencedbythe______inwhichitoccurs.
Thestudentsarerequiredto________themainideasofthearticleintheirownwords.
英語翻譯：生產力
Perseveranceisakindofqualityandthatis_______ittakestodoanythingwell.
DuringtheSecondWorldWar,Roosevelt,StalinandChurchillmetat________.
