Thenewdiscovery_______beofgreatservicetomankind.
A、isboundtoA
be bound to：注定要，一定会。本题中主语是 The new discovery ，所以谓语动词要用is。句意：这项新发现对于人类必定大有用处。
Ittookmeamonthtogetrid_______thecough.
Iftheoperation________carefullyprepared,itwouldnothavebeensuccessful.
Heblamedhispoorperformance_____jetlag.
Aftermonthsofvoyage,Columbusarrivedin______laterprovedtobeanewcontinent.
Itisdifficultto________theimplicationbetweenthelines.
