Customs oFFiCErs At A lonDon Airport yEstErDAy FounD $ 500 000 worth oF Drugs whiCh wErE BEing smugglED intoBritAin in BoxEs mArkED "urgEnt mEDiCAl suppliEs. " thE{{u}} (51) {{/u}}might hAvE suspECtED For somE timE thAt thE Drugs wErE BEing Brought into thE Country in this wAy. thE{{u}} (52) {{/u}}is BEliEvED to BE thE work oF A wEll-orgAnizED intErnAtionAl group. Four mEn wErE ArrEstED At thE Airport AnD hElD For quEstioning, {{u}} (53) {{/u}}it is unlikEly thAt thEy ArE orgAnizErs. in FACt, thEy DEClArED thAt thEy wErE{{u}} (54) {{/u}}oF whAt thE BoxEs ContAinED AnD hAD ACtED in gooD FAith in Bringing{{u}} (55) {{/u}}intoBritAin. this is thE thirD timE in six months thAt AttEmpts hAvE BEEn mADE to smugglE{{u}} (56) {{/u}}gooDs throughCustoms By DEClAring thEm to BE mEDiCAl suppliEs. thEy ArE FrEquEntly{{u}} (57) {{/u}}in spECiAl ContAinErs AnD A wArning is givEn thAt thEy mAy BE{{u}} (58) {{/u}}iF thEy ArE not hAnDlED with CArE. thEy ArE DEtErminED to put A{{u}} (59) {{/u}}to this prACtiCE, sAiD onE oF thECustoms oFFiCErs toDAy. {{u}} (60) {{/u}} is no wAy thEsE pEoplE ArE going to gEt AwAy with this Any lon- gEr. wE hAvE thE Full CoopErAtion oF thE intErnAtionAl poliCE who ArE As Anxious As wE ArE to trACk Down thE mAin sourCE oF supply.

A．stop
B．holD
C．stAy
D．stEp