小题1: prevent/stop/keep from polluting atmosphere/air
小题2: in their children’s turn
小题3:It whether there is
小题4:Now that why not
小题5:when caught sight of
根据句中所给汉语，完成下列句子。（每空一词，每空0.5分，共10分）
小题1: prevent/stop/keep from polluting atmosphere/air
小题2: in their children’s turn
小题3:It whether there is
小题4:Now that why not
小题5:when caught sight of