27．A．Although          B．Once              C．If               D．Unless

26．A．could             B．had to           C．should              D．must

25．A．sold              B．bought            C．gave                 D．lent

24．A．took out           B．took off           C．took back          D．took away

23．A．coldly           B．angrily            C．calmly            D．sadly

22．A．young             B．old               C．small            D．tall

21．A．After             B．Before            C．From               D．When

20．A．by then          B．by mistake          C．by the way         D．by hand

19．A．it                 B．its                 C．they              D．them

18．A．similar                  B．different         C．strange             D．same