翻译：Sineethepremiumvarieswiththescopeofinsuranee,extrapremiumisforbuyer'saeeount,shouldadditionalrisksbecovered.
TheultimategoaloflearningaforeignlanguageinaGrammar-Translationclassroomistoenablethestudentsto______itsliterature.
Inourdepartment,everystudent_________after-schoolactivities.
_______foralongtime,mostofthecropsinthisareadiedfromlackingwater.