【单选题】Riot police often use tear gas to ______ the mob.
【简答题】We often use the machine for bicycles.【改为被动语态) The machine__________ often__________ for bicycles by us.
【单选题】某工程各流水参数分别为 n=4,m=4,t=4,间歇时间为3,则其流水工期为( )天。
【简答题】We often use the term craving when referring to ______ addiction.