Totrade____thepeopleofalleountries____thebasisofequalityandmutualbenefitisourestablishedpolicy.
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TheultimategoaloflearningaforeignlanguageinaGrammar-Translationclassroomistoenablethestudentsto______itsliterature.
Itisdifficulttounderstandthiskindof_______calculation.
_______foralongtime,mostofthecropsinthisareadiedfromlackingwater.