Ihavebeenstudyinghereforfouryears,bynextsummerI________.
和平赎买的具体方式___________。
SinceWilliamhadbeenseriouslyillforseveralmonths,hisparentswereworriedabout________toreturntoschoolfull-time.
设A，B是两随机事件，则事件AB表示（）
Agreatnumberofsmallpowerstations________(setup)intheircounty sinceliberation.
