【单选题】—Where are his parents from? —They ________ from Nanjing. [ ]
【单选题】His English is improving _______, which makes both his parents and his teacher happy.
【单选题】He loves his parents deeply, ________ are very kind to him.
【单选题】The __________ of his books among parents and the recommendation of experts both at home and abroad have quickly made him a celebrity educator.
【单选题】42若正己烷中有杂质1-己烯,用洗涤方法能除去该杂质的试剂是 ( )
【单选题】Both his parents died in a traffic accident when he was a baby, so he was ______by his grandma. [ ]