完成句子(每题1.5分，共6分)
小题1:是我姐姐捡起那书的。
_____________my sister __________ picked up the book.
小题2:毫无疑问，搜寻那些丢失的文物的工作将会继续下去。
____________________________the search for those lost cultural relics will continue.
小题3:只有到这个时候我们才决定用暴力反抗暴力。
Only then __________________to answer violence with violence.
小题4:这是我一年半以来第一次目睹夜晚。
It was the first time in a year and a half that__________________ the night face to face.