11.A.arrived              B.had arrived              C.have arrived           D.has arrived

12.A.himself             B.itself                    C.themselves            D.herself

13.A.Likely               B.Luckily                 C.Immediately          D.Unfortunately

14.A.refused             B.hurried                 C.offered              D.forgot

15.A.when               B.while                  C.as                 D.until

16.A.make out           B.figure out                C.find out              D.work out

17.A.matter             B.question                C.thing                D.chance

18.A.send off him         B.send him off             C.sent off him          D.sent him off

19.A.think of             B.remind                 C.think about           D.remember

20.A.reason             B.time                   C.person             D.place