Theassociationis________toraisingfundstohelptheblind.
Wemust______thattheexperimentiscontrolledasrigidlyaspossible.
Forthenewcountrytosurvive,________foritspeopletoenjoyprosperity,neweconomicpolicieswillberequired.
Othersarguethatsincetheearthhasenduredalongstringoficeagesinthelasttwomilliontothreemillionyears,anywarmingis________tobetemporary.
Whenworkersareorganizedintradeunions,employersfindithardtolaythem________.
Tostudyaforeignlanguage,__________.